README.md

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doWhile

Invoke a function while a test condition is true.

Usage

import doWhile from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-do-while@deno/mod.js';

doWhile( fcn, predicate[, thisArg ] )

Invokes a function until a predicate function returns false. Note that the predicate function is evaluated after executing fcn; thus, fcn always executes at least once.

function predicate( i ) {
    return ( i < 5 );
}

function beep( i ) {
    console.log( 'boop: %d', i );
}

doWhile( beep, predicate );
/* =>
    boop: 0
    boop: 1
    boop: 2
    boop: 3
    boop: 4
*/

Both the predicate function and the function to invoke are provided a single argument:

• i: iteration number (starting from zero)

To set the function execution context for the invoked function, provide a thisArg.

function predicate( i ) {
    return ( i < 5 );
}

function count() {
    this.count += 1;
}

var context = {
    'count': 0
};

doWhile( count, predicate, context );

console.log( context.count );
// => 5

Examples

import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-base-randu@deno/mod.js';
import doWhile from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-do-while@deno/mod.js';

function predicate() {
    return ( randu() > 0.05 );
}

function log( i ) {
    console.log( i );
}

doWhile( log, predicate );

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See Also

• @stdlib/utils-do-until: invoke a function until a test condition is true.
• @stdlib/utils-async/do-while: invoke a function while a test condition is true.
• @stdlib/utils-do-while-each: while a test condition is true, invoke a function for each element in a collection.
• @stdlib/utils-until: invoke a function until a test condition is true.
• @stdlib/utils-while: invoke a function while a test condition is true.

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Notice

This package is part of stdlib, a standard library 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

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License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.