@stdlib/iter-nth NPM

iterNth

Return the nth iterated value.

Installation

npm install @stdlib/iter-nth

Usage

var iterNth = require( '@stdlib/iter-nth' );

iterNth( iterator, n )

Returns the nth iterated value.

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

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

var v = iterNth( arr, 3 );
// returns 1

If n exceeds the total number of iterated values, the function returns undefined.

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

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

var v = iterNth( arr, 10 );
// returns undefined

Examples

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

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 );

// Return the 50th threshold result:
var bool = iterNth( miter, 50 );
// returns <boolean>

console.log( bool );

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.