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isSafeInteger
Test if a finite double-precision floating-point number is a safe integer.
Installation
npm install @stdlib/math-base-assert-is-safe-integer
Usage
var isSafeInteger = require( '@stdlib/math-base-assert-is-safe-integer' );
isSafeInteger( x )
Tests if a finite double-precision floating-point number is a safe integer
.
var bool = isSafeInteger( 1.0 );
// returns true
Notes
-
An integer valued number is "safe" when the number can be exactly represented as a double-precision floating-point number. For example,
var MAX_SAFE_INTEGER = require( '@stdlib/constants-float64-max-safe-integer' ); // returns 9007199254740991 var x = 9007199254740992; // returns 9007199254740992 var y = 9007199254740993; // returns 9007199254740992 var bool = ( x === y ); // returns true
In this example,
x
andy
should be distinct, but they are not due to constraints imposed by storing numeric values in double-precision floating-point format. "Safe" integers are thus double-precision floating-point numbers having integer values with unequivocal binary representations.
Examples
var isSafeInteger = require( '@stdlib/math-base-assert-is-safe-integer' );
var bool = isSafeInteger( -5.0 );
// returns true
bool = isSafeInteger( 2.0e200 );
// returns false
bool = isSafeInteger( 3.14 );
// returns false
bool = isSafeInteger( NaN );
// returns false
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.