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High word mask for excluding the sign bit of a double-precision floating-point number.
To use in Observable,
FLOAT64_HIGH_WORD_ABS_MASK = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/constants-float64-high-word-abs-mask@umd/browser.js' )To vendor stdlib functionality and avoid installing dependency trees for Node.js, you can use the UMD server build:
var FLOAT64_HIGH_WORD_ABS_MASK = require( 'path/to/vendor/umd/constants-float64-high-word-abs-mask/index.js' )To include the bundle in a webpage,
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/constants-float64-high-word-abs-mask@umd/browser.js"></script>If no recognized module system is present, access bundle contents via the global scope:
<script type="text/javascript">
(function () {
window.FLOAT64_HIGH_WORD_ABS_MASK;
})();
</script>High word mask for excluding the sign bit of a double-precision floating-point number.
// 0x7fffffff = 2147483647 => 0 11111111111 11111111111111111111
var bool = ( FLOAT64_HIGH_WORD_ABS_MASK === 0x7fffffff );
// returns true- The higher order word of a double-precision floating-point number is a 32-bit integer containing the more significant bits which include the exponent and sign.
<!DOCTYPE html>
<html lang="en">
<body>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-get-high-word@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-get-low-word@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/number-float64-base-from-words@umd/browser.js"></script>
<script type="text/javascript" src="https://cdn.jsdelivr.net/gh/stdlib-js/constants-float64-high-word-abs-mask@umd/browser.js"></script>
<script type="text/javascript">
(function () {
var x = -11.5;
var hi = getHighWord( x ); // 1 10000000010 01110000000000000000
// returns 3223781376
// Turn off the sign bit and leave other bits unchanged:
var out = hi & FLOAT64_HIGH_WORD_ABS_MASK; // 0 10000000010 01110000000000000000
// returns 1076297728
// Generate a new value:
out = fromWords( out, getLowWord( x ) );
// returns 11.5
})();
</script>
</body>
</html>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.
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