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Split element values into two groups according to a predicate function.
import bifurcateValuesBy from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-bifurcate-values-by@deno/mod.js';Splits element values into two groups according to a predicate function.
function predicate( v ) {
return v[ 0 ] === 'b';
}
var x = [ 'beep', 'boop', 'foo', 'bar' ];
var out = bifurcateValuesBy( x, predicate );
// returns [ [ 'beep', 'boop', 'bar' ], [ 'foo' ] ]A predicate function is provided the following arguments:
- value: current array element.
- index: current array element index.
- arr: input array.
To set the predicate function execution context, provide a thisArg.
function predicate( v ) {
this.count += 1;
return v[ 0 ] === 'b';
}
var x = [ 'beep', 'boop', 'foo', 'bar' ];
var context = {
'count': 0
};
var out = bifurcateValuesBy( x, predicate, context );
// returns [ [ 'beep', 'boop', 'bar' ], [ 'foo' ] ]
var cnt = context.count;
// returns 4import discreteUniform from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-array-discrete-uniform@deno/mod.js';
import take from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-take-indexed@deno/mod.js';
import bifurcateValuesBy from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-bifurcate-values-by@deno/mod.js';
function predicate( v ) {
// Use the first letter of each element to define groups:
return v[ 0 ] === 'b';
}
// Define an initial array of values:
var values = [ 'beep', 'boop', 'foo', 'bar', 'woot', 'woot' ];
// Sample from the initial array to generate a random collection:
var indices = discreteUniform( 100, 0, values.length-1, {
'dtype': 'generic'
});
var x = take( values, indices );
// returns [...]
// Split the values:
var out = bifurcateValuesBy( x, predicate );
// returns [...]
console.log( out );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.
See LICENSE.
Copyright © 2016-2025. The Stdlib Authors.
