@stdlib/array-float64

What is @stdlib/array-float64?

The @stdlib/array-float64 package provides a Float64Array, which is a typed array that represents an array of 64-bit floating point numbers. This package is part of the larger @stdlib library, which is a standard library for JavaScript and Node.js, providing a wide range of utilities and functions.

What are @stdlib/array-float64's main functionalities?

Creating a Float64Array

This feature allows you to create a new Float64Array from an array of numbers. The resulting typed array contains 64-bit floating point numbers.

const Float64Array = require('@stdlib/array-float64');
const arr = new Float64Array([1.0, 2.0, 3.0, 4.0]);
console.log(arr);

Accessing Elements

This feature allows you to access elements in the Float64Array using standard array indexing.

const Float64Array = require('@stdlib/array-float64');
const arr = new Float64Array([1.0, 2.0, 3.0, 4.0]);
console.log(arr[0]); // 1.0
console.log(arr[1]); // 2.0

Modifying Elements

This feature allows you to modify elements in the Float64Array by assigning new values to specific indices.

const Float64Array = require('@stdlib/array-float64');
const arr = new Float64Array([1.0, 2.0, 3.0, 4.0]);
arr[0] = 5.0;
console.log(arr[0]); // 5.0

Iterating Over Elements

This feature allows you to iterate over the elements of the Float64Array using a for loop.

const Float64Array = require('@stdlib/array-float64');
const arr = new Float64Array([1.0, 2.0, 3.0, 4.0]);
for (let i = 0; i < arr.length; i++) {
  console.log(arr[i]);
}

Other packages similar to @stdlib/array-float64

typedarray

The 'typedarray' package provides a polyfill for the JavaScript typed array API, including Float64Array. It is useful for environments that do not natively support typed arrays. Compared to @stdlib/array-float64, 'typedarray' is more focused on providing compatibility rather than additional utilities.

ndarray

The 'ndarray' package provides a multidimensional array implementation for JavaScript. It supports various data types, including 64-bit floating point numbers. Compared to @stdlib/array-float64, 'ndarray' offers more advanced features for handling multidimensional data.

buffer

The 'buffer' package provides a way to handle binary data in Node.js. It includes support for creating and manipulating typed arrays, including Float64Array. Compared to @stdlib/array-float64, 'buffer' is more general-purpose and includes additional functionality for working with binary data.

README

About stdlib...

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The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

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Float64Array

Typed array constructor which returns a typed array representing an array of double-precision floating-point numbers in the platform byte order.

Installation

npm install @stdlib/array-float64

Usage

var Float64Array = require( '@stdlib/array-float64' );

Float64Array()

A typed array constructor which returns a typed array representing an array of double-precision floating-point numbers in the platform byte order.

var arr = new Float64Array();
// returns <Float64Array>

Float64Array( length )

Returns a typed array having a specified length.

var arr = new Float64Array( 5 );
// returns <Float64Array>[ 0.0, 0.0, 0.0, 0.0, 0.0 ]

Float64Array( typedarray )

Creates a typed array from another typed array.

var Float32Array = require( '@stdlib/array-float32' );

var arr1 = new Float32Array( [ 0.5, 0.5, 0.5 ] );
var arr2 = new Float64Array( arr1 );
// returns <Float64Array>[ 0.5, 0.5, 0.5 ]

Float64Array( obj )

Creates a typed array from an array-like object or iterable.

var arr = new Float64Array( [ 0.5, 0.5, 0.5 ] );
// returns <Float64Array>[ 0.5, 0.5, 0.5 ]

Float64Array( buffer[, byteOffset[, length]] )

Returns a typed array view of an ArrayBuffer.

var ArrayBuffer = require( '@stdlib/array-buffer' );

var buf = new ArrayBuffer( 32 );
var arr = new Float64Array( buf, 0, 4 );
// returns <Float64Array>[ 0.0, 0.0, 0.0, 0.0 ]

---

Properties

Float64Array.BYTES_PER_ELEMENT

Number of bytes per view element.

var nbytes = Float64Array.BYTES_PER_ELEMENT;
// returns 8

Float64Array.name

Typed array constructor name.

var str = Float64Array.name;
// returns 'Float64Array'

Float64Array.prototype.buffer

Read-only property which returns the ArrayBuffer referenced by the typed array.

var arr = new Float64Array( 5 );
var buf = arr.buffer;
// returns <ArrayBuffer>

Float64Array.prototype.byteLength

Read-only property which returns the length (in bytes) of the typed array.

var arr = new Float64Array( 5 );
var byteLength = arr.byteLength;
// returns 40

Float64Array.prototype.byteOffset

Read-only property which returns the offset (in bytes) of the typed array from the start of its ArrayBuffer.

var arr = new Float64Array( 5 );
var byteOffset = arr.byteOffset;
// returns 0

Float64Array.prototype.BYTES_PER_ELEMENT

Number of bytes per view element.

var arr = new Float64Array( 5 );
var nbytes = arr.BYTES_PER_ELEMENT;
// returns 8

Float64Array.prototype.length

Read-only property which returns the number of view elements.

var arr = new Float64Array( 5 );
var len = arr.length;
// returns 5

---

Methods

Float64Array.from( src[, map[, thisArg]] )

Creates a new typed array from an array-like object or an iterable.

var arr = Float64Array.from( [ 1.0, -1.0 ] );
// returns <Float64Array>[ 1.0, -1.0 ]

To invoke a function for each src value, provide a callback function.

function mapFcn( v ) {
    return v * 2.0;
}

var arr = Float64Array.from( [ 1.0, -1.0 ], mapFcn );
// returns <Float64Array>[ 2.0, -2.0 ]

A callback function is provided two arguments:

• value: source value
• index: source index

To set the callback execution context, provide a thisArg.

function mapFcn( v ) {
    this.count += 1;
    return v * 2.0;
}

var ctx = {
    'count': 0
};

var arr = Float64Array.from( [ 1.0, -1.0 ], mapFcn, ctx );
// returns <Float64Array>[ 2.0, -2.0 ]

var n = ctx.count;
// returns 2

Float64Array.of( element0[, element1[, ...elementN]] )

Creates a new typed array from a variable number of arguments.

var arr = Float64Array.of( 1.0, -1.0 );
// returns <Float64Array>[ 1.0, -1.0 ]

Float64Array.prototype.copyWithin( target, start[, end] )

Copies a sequence of elements within an array starting at start and ending at end (non-inclusive) to the position starting at target.

var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );

// Copy the last two elements to the first two elements:
arr.copyWithin( 0, 3 );

var v = arr[ 0 ];
// returns 4.0

v = arr[ 1 ];
// returns 5.0

By default, end equals the number of array elements (i.e., one more than the last array index). To limit the sequence length, provide an end argument.

var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );

// Copy the first two elements to the last two elements:
arr.copyWithin( 3, 0, 2 );

var v = arr[ 3 ];
// returns 1.0

v = arr[ 4 ];
// returns 2.0

When a target, start, and/or end index is negative, the respective index is determined relative to the last array element. The following example achieves the same behavior as the previous example:

var arr = new Float64Array( [ 1.0, 2.0, 3.0, 4.0, 5.0 ] );

// Copy the first two elements to the last two elements:
arr.copyWithin( -2, -5, -3 );

var v = arr[ 3 ];
// returns 1.0

v = arr[ 4 ];
// returns 2.0

Float64Array.prototype.entries()

Returns an iterator for iterating over array key-value pairs.

var arr = new Float64Array( [ 1.0, 2.0 ] );

// Create an iterator:
var it = arr.entries();

// Iterate over key-value pairs...
var v = it.next().value;
// returns [ 0, 1.0 ]

v = it.next().value;
// returns [ 1, 2.0 ]

var bool = it.next().done;
// returns true

Float64Array.prototype.every( predicate[, thisArg] )

Tests whether all array elements pass a test implemented by a predicate function.

function predicate( v ) {
    return ( v <= 1.0 );
}

var arr = new Float64Array( [ 1.0, 2.0 ] );

var bool = arr.every( predicate );
// returns false

A predicate function is provided three arguments:

• value: array element
• index: array index
• arr: array on which the method is invoked

To set the callback execution context, provide a thisArg.

function predicate( v ) {
    this.count += 1;
    return ( v >= 1.0 );
}

var ctx = {
    'count': 0
};

var arr = new Float64Array( [ 1.0, 2.0 ] );

var bool = arr.every( predicate, ctx );
// returns true

var n = ctx.count;
// returns 2

Float64Array.prototype.fill( value[, start[, end]] )

Fills an array from a start index to an end index (non-inclusive) with a provided value.

var arr = new Float64Array( 2 );

// Set all array elements to the same value:
arr.fill( 2.0 );

var v = arr[ 0 ];
// returns 2.0

v = arr[ 1 ];
// returns 2.0

// Set all array elements starting from the first index to the same value:
arr.fill( 3.0, 1 );

v = arr[ 0 ];
// returns 2.0

v = arr[ 1 ];
// returns 3.0

// Set all array elements, except the last element, to the same value:
arr.fill( 4.0, 0, arr.length-1 );

v = arr[ 0 ];
// returns 4.0

v = arr[ 1 ];
// returns 3.0

When a start and/or end index is negative, the respective index is determined relative to the last array element.

var arr = new Float64Array( 2 );

// Set all array elements, except the last element, to the same value:
arr.fill( 2.0, -arr.length, -1 );

var v = arr[ 0 ];
// returns 2.0

v = arr[ 1 ];
// returns 0.0

Float64Array.prototype.filter( predicate[, thisArg] )

Creates a new array (of the same data type as the host array) which includes those elements for which a predicate function returns a truthy value.

function predicate( v ) {
    return ( v >= 2.0 );
}

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.filter( predicate );
// returns <Float64Array>[ 2.0, 3.0 ]

If a predicate function does not return a truthy value for any array element, the method returns an empty array.

function predicate( v ) {
    return ( v >= 10.0 );
}

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.filter( predicate );
// returns <Float64Array>[]

A predicate function is provided three arguments:

• value: array element
• index: array index
• arr: array on which the method is invoked

To set the callback execution context, provide a thisArg.

function predicate( v ) {
    this.count += 1;
    return ( v >= 2.0 );
}

var ctx = {
    'count': 0
};

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.filter( predicate, ctx );

var n = ctx.count;
// returns 3

Float64Array.prototype.find( predicate[, thisArg] )

Returns the first array element for which a provided predicate function returns a truthy value.

function predicate( v ) {
    return ( v > 2.0 );
}

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var v = arr.find( predicate );
// returns 3.0

If a predicate function does not return a truthy value for any array element, the method returns undefined.

function predicate( v ) {
    return ( v < 1.0 );
}

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var v = arr.find( predicate );
// returns undefined

A predicate function is provided three arguments:

• value: array element
• index: array index
• arr: array on which the method is invoked

To set the callback execution context, provide a thisArg.

function predicate( v ) {
    this.count += 1;
    return ( v > 2.0 );
}

var ctx = {
    'count': 0
};

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var v = arr.find( predicate, ctx );
// returns 3.0

var n = ctx.count;
// returns 3

Float64Array.prototype.findIndex( predicate[, thisArg] )

Returns the index of the first array element for which a provided predicate function returns a truthy value.

function predicate( v ) {
    return ( v >= 3.0 );
}

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var idx = arr.findIndex( predicate );
// returns 2

If a predicate function does not return a truthy value for any array element, the method returns -1.

function predicate( v ) {
    return ( v < 1.0 );
}

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var idx = arr.findIndex( predicate );
// returns -1

A predicate function is provided three arguments:

• value: array element
• index: array index
• arr: array on which the method is invoked

To set the callback execution context, provide a thisArg.

function predicate( v ) {
    this.count += 1;
    return ( v >= 3.0 );
}

var ctx = {
    'count': 0
};

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var idx = arr.findIndex( predicate, ctx );
// returns 2

var n = ctx.count;
// returns 3

Float64Array.prototype.forEach( fcn[, thisArg] )

Invokes a callback for each array element.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var str = '';

function fcn( v, i ) {
    str += i + ':' + v;
    if ( i < arr.length-1 ) {
        str += ' ';
    }
}

arr.forEach( fcn );

console.log( str );
// => '0:1 1:2 2:3'

The callback is provided three arguments:

• value: array element
• index: array index
• arr: array on which the method is invoked

To set the callback execution context, provide a thisArg.

function fcn() {
    this.count += 1;
}

var ctx = {
    'count': 0
};

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

arr.forEach( fcn, ctx );

var n = ctx.count;
// returns 3

Float64Array.prototype.includes( searchElement[, fromIndex] )

Returns a boolean indicating whether an array includes a search element.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var bool = arr.includes( 3.0 );
// returns true

bool = arr.includes( 0.0 );
// returns false

By default, the method searches the entire array (fromIndex = 0). To begin searching from a specific array index, provide a fromIndex.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var bool = arr.includes( 1.0, 1 );
// returns false

When a fromIndex is negative, the starting index is resolved relative to the last array element.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var bool = arr.includes( 1.0, -2 );
// returns false

The method does not distinguish between signed and unsigned zero.

Float64Array.prototype.indexOf( searchElement[, fromIndex] )

Returns the index of the first array element strictly equal to a search element.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var idx = arr.indexOf( 3.0 );
// returns 2

idx = arr.indexOf( 0.0 );
// returns -1

By default, the method searches the entire array (fromIndex = 0). To begin searching from a specific array index, provide a fromIndex.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var idx = arr.indexOf( 1.0, 1 );
// returns -1

When a fromIndex is negative, the starting index is resolved relative to the last array element.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var idx = arr.indexOf( 1.0, -2 );
// returns -1

The method does not distinguish between signed and unsigned zero.

Float64Array.prototype.join( [separator] )

Serializes an array by joining all array elements as a string.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var str = arr.join();
// returns '1,2,3'

By default, the method delineates array elements using a comma ,. To specify a custom separator, provide a separator string.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var str = arr.join( '|' );
// returns '1|2|3'

Float64Array.prototype.keys()

Returns an iterator for iterating over array keys.

var arr = new Float64Array( [ 1.0, 2.0 ] );

// Create an iterator:
var it = arr.keys();

// Iterate over keys...
var v = it.next().value;
// returns 0

v = it.next().value;
// returns 1

var bool = it.next().done;
// returns true

Float64Array.prototype.lastIndexOf( searchElement[, fromIndex] )

Returns the index of the last array element strictly equal to a search element, iterating from right to left.

var arr = new Float64Array( [ 1.0, 0.0, 2.0, 0.0, 1.0 ] );

var idx = arr.lastIndexOf( 0.0 );
// returns 3

idx = arr.lastIndexOf( 3.0 );
// returns -1

By default, the method searches the entire array (fromIndex = -1). To begin searching from a specific array index, provide a fromIndex.

var arr = new Float64Array( [ 1.0, 0.0, 2.0, 0.0, 1.0 ] );

var idx = arr.lastIndexOf( 0.0, 2 );
// returns 1

When a fromIndex is negative, the starting index is resolved relative to the last array element.

var arr = new Float64Array( [ 1.0, 0.0, 2.0, 0.0, 1.0 ] );

var idx = arr.lastIndexOf( 0.0, -3 );
// returns 1

The method does not distinguish between signed and unsigned zero.

Float64Array.prototype.map( fcn[, thisArg] )

Maps each array element to an element in a new array having the same data type as the host array.

function fcn( v ) {
    return v * 2.0;
}

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.map( fcn );
// returns <Float64Array>[ 2.0, 4.0, 6.0 ]

A callback is provided three arguments:

• value: array element
• index: array index
• arr: array on which the method is invoked

To set the callback execution context, provide a thisArg.

function fcn( v ) {
    this.count += 1;
    return v * 2.0;
}

var ctx = {
    'count': 0
};

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.map( fcn, ctx );

var n = ctx.count;
// returns 3

Float64Array.prototype.reduce( fcn[, initialValue] )

Applies a function against an accumulator and each element in an array and returns the accumulated result.

function fcn( acc, v ) {
    return acc + ( v*v );
}

var arr = new Float64Array( [ 2.0, 1.0, 3.0 ] );

var v = arr.reduce( fcn );
// returns 12.0

If not provided an initial value, the method invokes a provided function with the first array element as the first argument and the second array element as the second argument.

If provided an initial value, the method invokes a provided function with the initial value as the first argument and the first array element as the second argument.

function fcn( acc, v ) {
    return acc + ( v*v );
}

var arr = new Float64Array( [ 2.0, 1.0, 3.0 ] );

var v = arr.reduce( fcn, 0.0 );
// returns 14.0

A callback is provided four arguments:

• acc: accumulated result
• value: array element
• index: array index
• arr: array on which the method is invoked

Float64Array.prototype.reduceRight( fcn[, initialValue] )

Applies a function against an accumulator and each element in an array and returns the accumulated result, iterating from right to left.

function fcn( acc, v ) {
    return acc + ( v*v );
}

var arr = new Float64Array( [ 2.0, 1.0, 3.0 ] );

var v = arr.reduceRight( fcn );
// returns 8.0

If not provided an initial value, the method invokes a provided function with the last array element as the first argument and the second-to-last array element as the second argument.

If provided an initial value, the method invokes a provided function with the initial value as the first argument and the last array element as the second argument.

function fcn( acc, v ) {
    return acc + ( v*v );
}

var arr = new Float64Array( [ 2.0, 1.0, 3.0 ] );

var v = arr.reduce( fcn, 0.0 );
// returns 14.0

A callback is provided four arguments:

• acc: accumulated result
• value: array element
• index: array index
• arr: array on which the method is invoked

Float64Array.prototype.reverse()

Reverses an array in-place (thus mutating the array on which the method is invoked).

var arr = new Float64Array( [ 2.0, 0.0, 3.0 ] );

// Reverse the array:
arr.reverse();

var v = arr[ 0 ];
// returns 3.0

v = arr[ 1 ];
// returns 0.0

v = arr[ 2 ];
// returns 2.0

Float64Array.prototype.set( arr[, offset] )

Sets array elements.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );
// returns <Float64Array>[ 1.0, 2.0, 3.0 ]

// Set the first two array elements:
arr.set( [ 4.0, 5.0 ] );

var v = arr[ 0 ];
// returns 4.0

v = arr[ 1 ];
// returns 5.0

By default, the method starts writing values at the first array index. To specify an alternative index, provide an index offset.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );
// returns <Float64Array>[ 1.0, 2.0, 3.0 ]

// Set the last two array elements:
arr.set( [ 4.0, 5.0 ], 1 );

var v = arr[ 1 ];
// returns 4.0

v = arr[ 2 ];
// returns 5.0

Float64Array.prototype.slice( [begin[, end]] )

Copies array elements to a new array with the same underlying data type as the host array.

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.slice();

var bool = ( arr1 === arr2 );
// returns false

bool = ( arr1.buffer === arr2.buffer );
// returns false

var v = arr2[ 0 ];
// returns 1.0

v = arr2[ 1 ];
// returns 2.0

v = arr2[ 2 ];
// returns 3.0

By default, the method copies elements beginning with the first array element. To specify an alternative array index at which to begin copying, provide a begin index (inclusive).

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.slice( 1 );

var len = arr2.length;
// returns 2

var v = arr2[ 0 ];
// returns 2.0

v = arr2[ 1 ];
// returns 3.0

By default, the method copies all array elements after begin. To specify an alternative array index at which to end copying, provide an end index (exclusive).

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.slice( 0, 2 );

var len = arr2.length;
// returns 2

var v = arr2[ 0 ];
// returns 1.0

v = arr2[ 1 ];
// returns 2.0

When a begin and/or end index is negative, the respective index is determined relative to the last array element.

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.slice( -arr1.length, -1 );

var len = arr2.length;
// returns 2

var v = arr2[ 0 ];
// returns 1.0

v = arr2[ 1 ];
// returns 2.0

Float64Array.prototype.some( predicate[, thisArg] )

Tests whether at least one array element passes a test implemented by a predicate function.

function predicate( v ) {
    return ( v >= 2.0 );
}

var arr = new Float64Array( [ 1.0, 2.0 ] );

var bool = arr.some( predicate );
// returns true

A predicate function is provided three arguments:

• value: array element
• index: array index
• arr: array on which the method is invoked

To set the callback execution context, provide a thisArg.

function predicate( v ) {
    this.count += 1;
    return ( v >= 2.0 );
}

var ctx = {
    'count': 0
};

var arr = new Float64Array( [ 1.0, 1.0 ] );

var bool = arr.some( predicate, ctx );
// returns false

var n = ctx.count;
// returns 2

Float64Array.prototype.sort( [compareFunction] )

Sorts an array in-place (thus mutating the array on which the method is invoked).

var arr = new Float64Array( [ 2.0, 3.0, 0.0 ] );

// Sort the array (in ascending order):
arr.sort();

var v = arr[ 0 ];
// returns 0.0

v = arr[ 1 ];
// returns 2.0

v = arr[ 2 ];
// returns 3.0

By default, the method sorts array elements in ascending order. To impose a custom order, provide a compareFunction.

function descending( a, b ) {
    return b - a;
}

var arr = new Float64Array( [ 2.0, 3.0, 0.0 ] );

// Sort the array (in descending order):
arr.sort( descending );

var v = arr[ 0 ];
// returns 3.0

v = arr[ 1 ];
// returns 2.0

v = arr[ 2 ];
// returns 0.0

The comparison function is provided two array elements, a and b, per invocation, and its return value determines the sort order as follows:

• If the comparison function returns a value less than zero, then the method sorts a to an index lower than b (i.e., a should come before b).
• If the comparison function returns a value greater than zero, then the method sorts a to an index higher than b (i.e., b should come before a).
• If the comparison function returns zero, then the relative order of a and b should remain unchanged.

Float64Array.prototype.subarray( [begin[, end]] )

Creates a new typed array view over the same underlying ArrayBuffer and with the same underlying data type as the host array.

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.subarray();
// returns <Float64Array>[ 1.0, 2.0, 3.0 ]

var bool = ( arr1.buffer === arr2.buffer );
// returns true

By default, the method creates a typed array view beginning with the first array element. To specify an alternative array index at which to begin, provide a begin index (inclusive).

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.subarray( 1 );
// returns <Float64Array>[ 2.0, 3.0 ]

var bool = ( arr1.buffer === arr2.buffer );
// returns true

By default, the method creates a typed array view which includes all array elements after begin. To limit the number of array elements after begin, provide an end index (exclusive).

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.subarray( 0, 2 );
// returns <Float64Array>[ 1.0, 2.0 ]

var bool = ( arr1.buffer === arr2.buffer );
// returns true

When a begin and/or end index is negative, the respective index is determined relative to the last array element.

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.subarray( -arr1.length, -1 );
// returns <Float64Array>[ 1.0, 2.0 ]

var bool = ( arr1.buffer === arr2.buffer );
// returns true

If the method is unable to resolve indices to a non-empty array subsequence, the method returns an empty typed array.

var arr1 = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var arr2 = arr1.subarray( 10, -1 );
// returns <Float64Array>[]

Float64Array.prototype.toLocaleString( [locales[, options]] )

Serializes an array as a locale-specific string.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var str = arr.toLocaleString();
// returns '1,2,3'

Float64Array.prototype.toString()

Serializes an array as a string.

var arr = new Float64Array( [ 1.0, 2.0, 3.0 ] );

var str = arr.toString();
// returns '1,2,3'

Float64Array.prototype.values()

Returns an iterator for iterating over array elements.

var arr = new Float64Array( [ 1.0, 2.0 ] );

// Create an iterator:
var it = arr.values();

// Iterate over array elements...
var v = it.next().value;
// returns 1.0

v = it.next().value;
// returns 2.0

var bool = it.next().done;
// returns true

---

Examples

var randu = require( '@stdlib/random-base-randu' );
var ctor = require( '@stdlib/array-float64' );

var arr;
var i;

arr = new ctor( 10 );
for ( i = 0; i < arr.length; i++ ) {
    arr[ i ] = randu() * 100.0;
}
console.log( arr );

---

See Also

• @stdlib/array-buffer: ArrayBuffer.
• @stdlib/array-float32: Float32Array.
• @stdlib/array-int16: Int16Array.
• @stdlib/array-int32: Int32Array.
• @stdlib/array-int8: Int8Array.
• @stdlib/array-uint16: Uint16Array.
• @stdlib/array-uint32: Uint32Array.
• @stdlib/array-uint8: Uint8Array.
• @stdlib/array-uint8c: Uint8ClampedArray.

---

Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

Community

---

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.

Changelog

0.2.0 (2024-02-14)

<section class="commits">

Commits

<details>

• 7120ab7 - docs: add missing var declarations (by Philipp Burckhardt)
• 4626ee3 - build: remove tslint directives (by Philipp Burckhardt)
• 8fbd70f - build: replace tslint directive with eslint equivalent (by Philipp Burckhardt)

</details> </section> <!-- /.commits --> <section class="contributors">

Contributors

A total of 1 person contributed to this release. Thank you to this contributor:

• Philipp Burckhardt

</section> <!-- /.contributors --> </section> <!-- /.release --> <section class="release" id="v0.1.1">