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Create an uninitialized array having the same length and data type as a provided array.
npm install @stdlib/array-empty-likeAlternatively,
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var emptyLike = require( '@stdlib/array-empty-like' );Creates an uninitialized array having the same length and data type as a provided array x.
var x = [ 1, 2, 3, 4, 5 ];
var arr = emptyLike( x );
// returns [ 0, 0, 0, 0, 0 ];The function recognizes the following data types:
float64: double-precision floating-point numbers (IEEE 754)float32: single-precision floating-point numbers (IEEE 754)complex128: double-precision complex floating-point numberscomplex64: single-precision complex floating-point numbersint32: 32-bit two's complement signed integersuint32: 32-bit unsigned integersint16: 16-bit two's complement signed integersuint16: 16-bit unsigned integersint8: 8-bit two's complement signed integersuint8: 8-bit unsigned integersuint8c: 8-bit unsigned integers clamped to0-255generic: generic JavaScript values
By default, the output array data type is inferred from the provided array x. To return an array having a different data type, provide a dtype argument.
var x = [ 1, 1 ];
var arr = emptyLike( x, 'int32' );
// returns <Int32Array>- In browser environments, the function always returns zero-filled arrays.
- If
dtypeis'generic', the function always returns a zero-filled array. - In Node.js versions
>=3.0.0, the underlying memory of returned typed arrays is not initialized. Memory contents are unknown and may contain sensitive data.
var dtypes = require( '@stdlib/array-dtypes' );
var zeros = require( '@stdlib/array-zeros' );
var emptyLike = require( '@stdlib/array-empty-like' );
// Create a zero-filled array:
var x = zeros( 4, 'complex128' );
// Get a list of array data types:
var dt = dtypes();
// Generate empty arrays...
var arr;
var i;
for ( i = 0; i < dt.length; i++ ) {
arr = emptyLike( x, dt[ i ] );
console.log( arr );
}@stdlib/array-empty: create an uninitialized array having a specified length.@stdlib/array-full-like: create a filled array having the same length and data type as a provided array.@stdlib/array-ones-like: create an array filled with ones and having the same length and data type as a provided array.@stdlib/array-zeros-like: create a zero-filled array having the same length and data type as a provided array.@stdlib/ndarray-empty-like: create an uninitialized ndarray having the same shape and data type as a provided ndarray.
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 © 2016-2024. The Stdlib Authors.
