The 'long' npm package provides a comprehensive library for representing, converting, and performing arithmetic operations on 64-bit integers. This is particularly useful in environments like JavaScript, where the standard Number type can only safely represent integers up to 53 bits.

What are long's main functionalities?

Creation of Long integers

This feature allows the creation of 64-bit integers. The constructor takes two arguments representing the low and high 32 bits of the integer, respectively.

const Long = require('long');
let longVal = new Long(0xFFFFFFFF, 0x7FFFFFFF);

Arithmetic operations

This feature supports basic arithmetic operations such as addition, subtraction, multiplication, and division on 64-bit integers.

const Long = require('long');
let long1 = new Long(1, 0);
let long2 = new Long(1, 0);
let sum = long1.add(long2);

Comparison operations

This feature enables comparison operations like less than, greater than, equals, etc., between two Long instances.

const Long = require('long');
let long1 = new Long(1, 0);
let long2 = new Long(2, 0);
let isLessThan = long1.lessThan(long2);

Other packages similar to long

Readme

Source

A Long class for representing a 64 bit two's-complement integer value derived from the Closure Library for stand-alone use and extended with unsigned support.

Background

As of ECMA-262 5th Edition, "all the positive and negative integers whose magnitude is no greater than 2⁵³ are representable in the Number type", which is "representing the doubleprecision 64-bit format IEEE 754 values as specified in the IEEE Standard for Binary Floating-Point Arithmetic". The maximum safe integer in JavaScript is 2⁵³-1.

Example: 2⁶⁴-1 is 18446744073709551615 but in JavaScript it evaluates to 18446744073709552000.

Furthermore, bitwise operators in JavaScript "deal only with integers in the range −2³¹ through 2³¹−1, inclusive, or in the range 0 through 2³²−1, inclusive. These operators accept any value of the Number type but first convert each such value to one of 2³² integer values."

In some use cases, however, it is required to be able to reliably work with and perform bitwise operations on the full 64 bits. This is where long.js comes into play.

Usage

The class is compatible with CommonJS and AMD loaders and is exposed globally as dcodeIO.Long if neither is available.

var Long = require("long");

var longVal = new Long(0xFFFFFFFF, 0x7FFFFFFF);
console.log(longVal.toString());
...

API

new Long(low, high=, unsigned=)

Constructs a 64 bit two's-complement integer, given its low and high 32 bit values as signed integers. See the from* functions below for more convenient ways of constructing Longs.

Parameter	Type	Description
low	number	The low (signed) 32 bits of the long
high	number	The high (signed) 32 bits of the long
unsigned	boolean	Whether unsigned or not, defaults to `false` for signed

Long.MAX_UNSIGNED_VALUE

Maximum unsigned value.


@type	!Long

Long.MAX_VALUE

Maximum signed value.


@type	!Long

Long.MIN_VALUE

Minimum signed value.


@type	!Long

Long.NEG_ONE

Signed negative one.


@type	!Long

Long.ONE

Signed one.


@type	!Long

Long.UONE

Unsigned one.


@type	!Long

Long.UZERO

Unsigned zero.


@type	!Long

Long.ZERO

Signed zero.


@type	!Long

Long.fromBits(lowBits, highBits, unsigned=)

Returns a Long representing the 64 bit integer that comes by concatenating the given low and high bits. Each is assumed to use 32 bits.

Parameter	Type	Description
lowBits	number	The low 32 bits
highBits	number	The high 32 bits
unsigned	boolean	Whether unsigned or not, defaults to `false` for signed
@returns	!Long	The corresponding Long value

Long.fromInt(value, unsigned=)

Returns a Long representing the given 32 bit integer value.

Parameter	Type	Description
value	number	The 32 bit integer in question
unsigned	boolean	Whether unsigned or not, defaults to `false` for signed
@returns	!Long	The corresponding Long value

Long.fromNumber(value, unsigned=)

Returns a Long representing the given value, provided that it is a finite number. Otherwise, zero is returned.

Parameter	Type	Description
value	number	The number in question
unsigned	boolean	Whether unsigned or not, defaults to `false` for signed
@returns	!Long	The corresponding Long value

Long.fromString(str, unsigned=, radix=)

Returns a Long representation of the given string, written using the specified radix.

Parameter	Type	Description
str	string	The textual representation of the Long
unsigned	boolean \| number	Whether unsigned or not, defaults to `false` for signed
radix	number	The radix in which the text is written (2-36), defaults to 10
@returns	!Long	The corresponding Long value

Long.isLong(obj)

Tests if the specified object is a Long.

Parameter	Type	Description
obj	***	Object
@returns	boolean

Long.fromValue(val)

Converts the specified value to a Long.

Parameter	Type	Description
val	!Long \| number \| string \| !{low: number, high: number, unsigned: boolean}	Value
@returns	!Long

Long#high

The high 32 bits as a signed value.


@type	number

Long#low

The low 32 bits as a signed value.


@type	number

Long#unsigned

Whether unsigned or not.


@type	boolean

Long#add(addend)

Returns the sum of this and the specified Long.

Parameter	Type	Description
addend	!Long \| number \| string	Addend
@returns	!Long	Sum

Long#and(other)

Returns the bitwise AND of this Long and the specified.

Parameter	Type	Description
other	!Long \| number \| string	Other Long
@returns	!Long

Long#compare/comp(other)

Compares this Long's value with the specified's.

Parameter	Type	Description
other	!Long \| number \| string	Other value
@returns	number	0 if they are the same, 1 if the this is greater and -1 if the given one is greater

Long#divide/div(divisor)

Returns this Long divided by the specified.

Parameter	Type	Description
divisor	!Long \| number \| string	Divisor
@returns	!Long	Quotient

Long#equals/eq(other)

Tests if this Long's value equals the specified's.

Parameter	Type	Description
other	!Long \| number \| string	Other value
@returns	boolean

Long#getHighBits()

Gets the high 32 bits as a signed integer.

Parameter	Type	Description
@returns	number	Signed high bits

Long#getHighBitsUnsigned()

Gets the high 32 bits as an unsigned integer.

Parameter	Type	Description
@returns	number	Unsigned high bits

Long#getLowBits()

Gets the low 32 bits as a signed integer.

Parameter	Type	Description
@returns	number	Signed low bits

Long#getLowBitsUnsigned()

Gets the low 32 bits as an unsigned integer.

Parameter	Type	Description
@returns	number	Unsigned low bits

Long#getNumBitsAbs()

Gets the number of bits needed to represent the absolute value of this Long.

Parameter	Type	Description
@returns	number

Long#greaterThan/gt(other)

Tests if this Long's value is greater than the specified's.

Parameter	Type	Description
other	!Long \| number \| string	Other value
@returns	boolean

Long#greaterThanOrEqual/gte(other)

Tests if this Long's value is greater than or equal the specified's.

Parameter	Type	Description
other	!Long \| number \| string	Other value
@returns	boolean

Long#isEven()

Tests if this Long's value is even.

Parameter	Type	Description
@returns	boolean

Long#isNegative()

Tests if this Long's value is negative.

Parameter	Type	Description
@returns	boolean

Long#isOdd()

Tests if this Long's value is odd.

Parameter	Type	Description
@returns	boolean

Long#isPositive()

Tests if this Long's value is positive.

Parameter	Type	Description
@returns	boolean

Long#isZero()

Tests if this Long's value equals zero.

Parameter	Type	Description
@returns	boolean

Long#lessThan/lt(other)

Tests if this Long's value is less than the specified's.

Parameter	Type	Description
other	!Long \| number \| string	Other value
@returns	boolean

Long#lessThanOrEqual/lte(other)

Tests if this Long's value is less than or equal the specified's.

Parameter	Type	Description
other	!Long \| number \| string	Other value
@returns	boolean

Long#modulo/mod(divisor)

Returns this Long modulo the specified.

Parameter	Type	Description
divisor	!Long \| number \| string	Divisor
@returns	!Long	Remainder

Long#multiply/mul(multiplier)

Returns the product of this and the specified Long.

Parameter	Type	Description
multiplier	!Long \| number \| string	Multiplier
@returns	!Long	Product

Long#negate/neg()

Negates this Long's value.

Parameter	Type	Description
@returns	!Long	Negated Long

Long#not()

Returns the bitwise NOT of this Long.

Parameter	Type	Description
@returns	!Long

Long#notEquals/neq(other)

Tests if this Long's value differs from the specified's.

Parameter	Type	Description
other	!Long \| number \| string	Other value
@returns	boolean

Long#or(other)

Returns the bitwise OR of this Long and the specified.

Parameter	Type	Description
other	!Long \| number \| string	Other Long
@returns	!Long

Long#shiftLeft/shl(numBits)

Returns this Long with bits shifted to the left by the given amount.

Parameter	Type	Description
numBits	number \| !Long	Number of bits
@returns	!Long	Shifted Long

Long#shiftRight/shr(numBits)

Returns this Long with bits arithmetically shifted to the right by the given amount.

Parameter	Type	Description
numBits	number \| !Long	Number of bits
@returns	!Long	Shifted Long

Long#shiftRightUnsigned/shru(numBits)

Returns this Long with bits logically shifted to the right by the given amount.

Parameter	Type	Description
numBits	number \| !Long	Number of bits
@returns	!Long	Shifted Long

Long#subtract/sub(subtrahend)

Returns the difference of this and the specified Long.

Parameter	Type	Description
subtrahend	!Long \| number \| string	Subtrahend
@returns	!Long	Difference

Long#toInt()

Converts the Long to a 32 bit integer, assuming it is a 32 bit integer.

Parameter	Type	Description
@returns	number

Long#toNumber()

Converts the Long to a the nearest floating-point representation of this value (double, 53 bit mantissa).

Parameter	Type	Description
@returns	number

Long#toSigned()

Converts this Long to signed.

Parameter	Type	Description
@returns	!Long	Signed long

Long#toString(radix=)

Converts the Long to a string written in the specified radix.

Parameter	Type	Description
radix	number	Radix (2-36), defaults to 10
@returns	string
@throws	RangeError	If `radix` is out of range

Long#toUnsigned()

Converts this Long to unsigned.

Parameter	Type	Description
@returns	!Long	Unsigned long

Long#xor(other)

Returns the bitwise XOR of this Long and the given one.

Parameter	Type	Description
other	!Long \| number \| string	Other Long
@returns	!Long

Downloads

License

Apache License, Version 2.0 - http://www.apache.org/licenses/LICENSE-2.0.html

Keywords

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Last updated on 01 Apr 2016

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