iterCuSome

Create an iterator which cumulatively tests whether at least n iterated values are truthy.

Usage

var iterCuSome = require( '@stdlib/iter/cusome' );

iterCuSome( iterator, n )

Returns an iterator which cumulatively tests whether at least n iterated values are truthy.

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

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

var it = iterCuSome( arr, 2 );

var v = it.next().value;
// returns false

v = it.next().value;
// returns false

v = it.next().value;
// returns false

v = it.next().value;
// returns true

v = it.next().value;
// returns true

var bool = it.next().done;
// returns true

The returned iterator protocol-compliant object has the following properties:

next: function which returns an iterator protocol-compliant object containing the next iterated value (if one exists) assigned to a value property and a done property having a boolean value indicating whether the iterator is finished.
return: function which closes an iterator and returns a single (optional) argument in an iterator protocol-compliant object.

Examples

var randu = require( '@stdlib/random/iter/randu' );
var iterMap = require( '@stdlib/iter/map' );
var iterCuSome = require( '@stdlib/iter/cusome' );

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 );

// Create an iterator which cumulatively tests whether at least 5 iterated values are truthy:
var it = iterCuSome( miter, 5 );

// Perform manual iteration...
var r;
while ( true ) {
    r = it.next();
    if ( r.done ) {
        break;
    }
    console.log( r.value );
}