@stdlib/assert-is-number
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Package description
@stdlib/assert-is-number is a utility package that provides functions to check if a value is a number. It includes checks for different types of numbers such as finite numbers, integers, and NaN values.
isNumber
The `isNumber` function checks if a value is a number. It returns `true` if the value is a number and `false` otherwise.
const isNumber = require('@stdlib/assert-is-number');
console.log(isNumber(5)); // true
console.log(isNumber('5')); // falseisFinite
The `isFinite` function checks if a value is a finite number. It returns `true` if the value is finite and `false` otherwise.
const isFinite = require('@stdlib/assert-is-number').isFinite;
console.log(isFinite(5)); // true
console.log(isFinite(Infinity)); // falseisInteger
The `isInteger` function checks if a value is an integer. It returns `true` if the value is an integer and `false` otherwise.
const isInteger = require('@stdlib/assert-is-number').isInteger;
console.log(isInteger(5)); // true
console.log(isInteger(5.5)); // falseisNaN
The `isNaN` function checks if a value is NaN (Not-a-Number). It returns `true` if the value is NaN and `false` otherwise.
const isNaN = require('@stdlib/assert-is-number').isNaN;
console.log(isNaN(NaN)); // true
console.log(isNaN(5)); // falseThe `is-number` package provides a simple utility to check if a value is a number. It is similar to `@stdlib/assert-is-number` but with fewer features. It mainly focuses on checking if a value is a number and does not include checks for finite numbers, integers, or NaN values.
Lodash is a utility library that provides a wide range of functions for common programming tasks, including type checking. The `_.isNumber` function in Lodash can be used to check if a value is a number. While Lodash offers more comprehensive functionality beyond type checking, it is heavier and includes many features that may not be necessary if you only need number validation.
The `validator` package is a library for string validation and sanitization. It includes a function `isNumeric` that checks if a string contains only numbers. While it is not as comprehensive as `@stdlib/assert-is-number` for number validation, it is useful for validating numeric strings.
Readme
Test if a value is a number.
npm install @stdlib/assert-is-number
var isNumber = require( '@stdlib/assert-is-number' );
Tests if a value is a number.
var Number = require( '@stdlib/number-ctor' );
var bool = isNumber( 3.14 );
// returns true
bool = isNumber( new Number( 3.14 ) );
// returns true
bool = isNumber( NaN );
// returns true
bool = isNumber( null );
// returns false
Tests if a value is a primitive number.
var Number = require( '@stdlib/number-ctor' );
var bool = isNumber.isPrimitive( 3.14 );
// returns true
bool = isNumber.isPrimitive( NaN );
// returns true
bool = isNumber.isPrimitive( new Number( 3.14 ) );
// returns false
Tests if a value is a Number object.
var Number = require( '@stdlib/number-ctor' );
var bool = isNumber.isObject( 3.14 );
// returns false
bool = isNumber.isObject( new Number( 3.14 ) );
// returns true
var Number = require( '@stdlib/number-ctor' );
var isNumber = require( '@stdlib/assert-is-number' );
var bool = isNumber( 5 );
// returns true
bool = isNumber( new Number( 5 ) );
// returns true
bool = isNumber( NaN );
// returns true
bool = isNumber( '5' );
// returns false
bool = isNumber( null );
// returns false
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.
See LICENSE.
Copyright © 2016-2021. The Stdlib Authors.
FAQs
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We found that @stdlib/assert-is-number demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 4 open source maintainers collaborating on the project.
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