iterSome

Test whether at least n iterated values are truthy.

Installation

npm install @stdlib/iter-some

Usage

var iterSome = require( '@stdlib/iter-some' );

iterSome( iterator, n )

Tests whether at least n iterated values are truthy.

var array2iterator = require( '@stdlib/array-to-iterator' );

var arr = array2iterator( [ 0, 0, 1, 1, 1 ] );

var bool = iterSome( arr, 3 );
// returns true

If a provided iterator does not return any iterated values, the function returns false.

var array2iterator = require( '@stdlib/array-to-iterator' );

var bool = iterSome( array2iterator( [] ), 1 );
// returns false

Examples

var randu = require( '@stdlib/random-iter-randu' );
var iterMap = require( '@stdlib/iter-map' );
var iterSome = require( '@stdlib/iter-some' );

function threshold( r ) {
    return ( r > 0.95 );
}

// Create an iterator which generates uniformly distributed pseudorandom numbers:
var opts = {
    'iter': 100
};
var riter = randu( opts );

// Create an iterator which applies a threshold to generated numbers:
var miter = iterMap( riter, threshold );

// Determine if at least 5 values are "truthy":
var bool = iterSome( miter, 5 );
// returns <boolean>

console.log( bool );

See Also

• @stdlib/iter-any: test whether at least one iterated value is truthy.
• @stdlib/iter-every: test whether all iterated values are truthy.
• @stdlib/iter-for-each: create an iterator which invokes a function for each iterated value before returning the iterated value.
• @stdlib/iter-none: test whether all iterated values are falsy.
• @stdlib/iter-some-by: test whether at least n iterated values pass a test implemented by a predicate function.

Notice

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.

Community

License

See LICENSE.

Copyright

Copyright © 2016-2024. The Stdlib Authors.