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Test whether all elements in an array fail a test implemented by a predicate function.
import noneBy from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-none-by@deno/mod.js';
The previous example will load the latest bundled code from the deno branch. Alternatively, you may load a specific version by loading the file from one of the tagged bundles. For example,
import noneBy from 'https://cdn.jsdelivr.net/gh/stdlib-js/[email protected]/mod.js';
Tests whether all elements in an array fail a test implemented by a predicate
function.
function isPositive( value ) {
return ( value > 0 );
}
var x = [ 0, 0, 0, 0 ];
var bool = noneBy( x, isPositive );
// returns true
If a predicate
function returns a truthy value, the function immediately returns false
.
function isPositive( value ) {
return ( value > 0 );
}
var x = [ -1, -2, 3, -4 ];
var bool = noneBy( x, isPositive );
// returns false
The predicate
function is provided three 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( value ) {
this.count += 1;
return ( value < 0 );
}
var x = [ 1, 2, -3, 4 ];
var context = {
'count': 0
};
var bool = noneBy( x, predicate, context );
// returns false
var cnt = context.count;
// returns 3
- The function performs a linear scan and returns immediately upon encountering a truthy return value. Unlike
Array.prototype.every
, when performing a linear scan, the function does not skipundefined
elements. - If provided an empty array, the function returns
true
.
import bernoulli from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-array-bernoulli@deno/mod.js';
var isPositiveInteger = require( 'https://cdn.jsdelivr.net/gh/stdlib-js/assert-is-positive-integer' ).isPrimitive;
import naryFunction from 'https://cdn.jsdelivr.net/gh/stdlib-js/utils-nary-function@deno/mod.js';
import noneBy from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-base-none-by@deno/mod.js';
var x = bernoulli( 10, 0.1, {
'dtype': 'int8'
});
// returns <Int8Array>
var out = noneBy( x, naryFunction( isPositiveInteger, 1 ) );
// returns <boolean>
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.
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