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Fill an array-like object view from right to left with values returned from an iterator.
import iterator2arrayviewRight from 'https://cdn.jsdelivr.net/gh/stdlib-js/iter-to-array-view-right@deno/mod.js';Fills an array-like object view from right to left with values returned from an iterator.
import Uint8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@deno/mod.js';
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@deno/mod.js';
var iter = array2iterator( [ 1, 2, 3, 4 ] );
var arr = iterator2arrayviewRight( iter, new Uint8Array( 10 ) );
// returns <Uint8Array>[ 0, 0, 0, 0, 0, 0, 4, 3, 2, 1 ]The begin and end arguments define the starting (inclusive) and ending (non-inclusive) indices of the array view. By default, the function begins filling from the last element of a provided array-like object (i.e., from the "end"). To specify an alternative view end, provide an end argument (zero-based and non-inclusive).
import Uint8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@deno/mod.js';
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@deno/mod.js';
var iter = array2iterator( [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] );
var arr = iterator2arrayviewRight( iter, new Uint8Array( 10 ), 0, 4 );
// returns <Uint8Array>[ 4, 3, 2, 1, 0, 0, 0, 0, 0, 0 ]If end is less than 0, the last view element is resolved relative to the last element of the provided array-like object. For example, the following achieves the same behavior as the previous example
import Uint8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@deno/mod.js';
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@deno/mod.js';
var iter = array2iterator( [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] );
var arr = iterator2arrayviewRight( iter, new Uint8Array( 10 ), 0, -6 );
// returns <Uint8Array>[ 4, 3, 2, 1, 0, 0, 0, 0, 0, 0 ]By default, the function fills through the first element of the provided array-like object. To specify an alternative view beginning, provide a begin argument (zero-based and inclusive).
import Uint8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@deno/mod.js';
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@deno/mod.js';
var iter = array2iterator( [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] );
var arr = iterator2arrayviewRight( iter, new Uint8Array( 10 ), 3 );
// returns <Uint8Array>[ 0, 0, 0, 7, 6, 5, 4, 3, 2, 1 ]If begin is less than 0, the first view element index is resolved relative to the last element of the provided array-like object. For example, the following achieves the same behavior as the previous example
import Uint8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@deno/mod.js';
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@deno/mod.js';
var iter = array2iterator( [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 ] );
var arr = iterator2arrayviewRight( iter, new Uint8Array( 10 ), -7 );
// returns <Uint8Array>[ 0, 0, 0, 7, 6, 5, 4, 3, 2, 1 ]To invoke a function for each iterated value, provide a callback function.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@deno/mod.js';
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@deno/mod.js';
function fcn( v ) {
return v * 10.0;
}
var iter = array2iterator( [ 1, 2, 3, 4 ] );
var arr = iterator2arrayviewRight( iter, new Float64Array( 4 ), fcn );
// returns <Float64Array>[ 40.0, 30.0, 20.0, 10.0 ]The invoked function is provided three arguments:
- value: iterated value.
- index: destination index (zero-based).
- n: iteration index (zero-based).
import Uint8Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-uint8@deno/mod.js';
import array2iterator from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-to-iterator@deno/mod.js';
function fcn( v, i, n ) {
return v * (n+1);
}
var iter = array2iterator( [ 1, 2, 3, 4 ] );
var arr = iterator2arrayviewRight( iter, new Uint8Array( 4 ), fcn );
// returns <Uint8Array>[ 16, 9, 4, 1 ]To set the callback function execution context, provide a thisArg.
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@deno/mod.js';
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-iter-randu@deno/mod.js';
function fcn( v ) {
this.count += 1;
return v * 10.0;
}
var ctx = {
'count': 0
};
var arr = iterator2arrayviewRight( randu(), new Float64Array( 10 ), fcn, ctx );
// returns <Float64Array>
var count = ctx.count;
// returns 10- Iteration stops when an output array view is full or an iterator finishes; whichever comes first.
- The function supports output array-like objects having getter and setter accessors for array element access (e.g.,
@stdlib/array-complex64).
import Float64Array from 'https://cdn.jsdelivr.net/gh/stdlib-js/array-float64@deno/mod.js';
import randu from 'https://cdn.jsdelivr.net/gh/stdlib-js/random-iter-randu@deno/mod.js';
import iterator2arrayviewRight from 'https://cdn.jsdelivr.net/gh/stdlib-js/iter-to-array-view-right@deno/mod.js';
function scale( v, i, n ) {
return v * (n+1) * 10.0;
}
// Create an iterator for generating uniformly distributed pseudorandom numbers:
var it = randu();
// Fill an array view with scaled iterator values:
var arr = iterator2arrayviewRight( it, new Float64Array( 100 ), 40, 60, scale );
var i;
for ( i = 0; i < arr.length; i++ ) {
console.log( arr[ i ] );
}@stdlib/array-from-iterator: create (or fill) an array from an iterator.@stdlib/array-to-view-iterator-right: create an iterator from an array-like object view, iterating from right to left.@stdlib/iter-to-array-view: fill an array-like object view with values returned from an iterator.
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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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