time-to-botec

README.md (5739B)

---

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 # sparsearray2iteratorRight
 
 > Create an iterator from a sparse array-like object, iterating from right to left.
 
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 </section>
 
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 <!-- Package usage documentation. -->
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var sparsearray2iteratorRight = require( '@stdlib/array/to-sparse-iterator-right' );
 ```
 
 #### sparsearray2iteratorRight( src\[, mapFcn\[, thisArg]] )
 
 Returns an iterator which iterates from right to left over each element in a sparse array-like `object`.
 
 <!-- eslint-disable no-sparse-arrays -->
 
 ```javascript
 var it = sparsearray2iteratorRight( [ 1, , , 4 ] );
 // returns <Object>
 
 var v = it.next().value;
 // returns 4
 
 v = it.next().value;
 // returns 1
 
 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.
 
 To invoke a function for each `src` value, provide a callback function.
 
 <!-- eslint-disable no-sparse-arrays -->
 
 ```javascript
 function fcn( v ) {
     return v * 10.0;
 }
 
 var it = sparsearray2iteratorRight( [ 1, 2, , 4 ], fcn );
 // returns <Object>
 
 var v = it.next().value;
 // returns 40.0
 
 v = it.next().value;
 // returns 20.0
 
 // ...
 ```
 
 The invoked function is provided three arguments:
 
 -   `value`: iterated value
 -   `index`: iterated value index
 -   `src`: source array-like object
 
 <!-- eslint-disable no-sparse-arrays -->
 
 ```javascript
 function fcn( v, i ) {
     return v * (i+1);
 }
 
 var it = sparsearray2iteratorRight( [ 1, 2, , 4 ], fcn );
 // returns <Object>
 
 var v = it.next().value;
 // returns 16
 
 v = it.next().value;
 // returns 4
 
 v = it.next().value;
 // returns 1
 ```
 
 To set the callback function execution context, provide a `thisArg`.
 
 <!-- eslint-disable no-sparse-arrays -->
 
 ```javascript
 function fcn( v ) {
     this.count += 1;
     return v * 10.0;
 }
 
 var ctx = {
     'count': 0
 };
 
 var it = sparsearray2iteratorRight( [ 1, 2, , 4 ], fcn, ctx );
 // returns <Object>
 
 var v = it.next().value;
 // returns 40.0
 
 v = it.next().value;
 // returns 20.0
 
 var count = ctx.count;
 // returns 2
 ```
 
 </section>
 
 <!-- /.usage -->
 
 <!-- Package usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="notes">
 
 ## Notes
 
 -   If an environment supports `Symbol.iterator`, the returned iterator is iterable.
 -   If provided a generic `array`, the returned iterator **ignores** holes (i.e., `undefined` values). To iterate over all generic `array` elements, use [`@stdlib/array/to-iterator-right`][@stdlib/array/to-iterator-right].
 -   A returned iterator does **not** copy a provided array-like `object`. To ensure iterable reproducibility, copy a provided array-like `object` **before** creating an iterator. Otherwise, any changes to the contents of an array-like `object` will be reflected in the returned iterator.
 -   In environments supporting `Symbol.iterator`, the function **explicitly** does **not** invoke an array's `@@iterator` method, regardless of whether this method is defined. To convert an array to an implementation defined iterator, invoke this method directly.
 
 </section>
 
 <!-- /.notes -->
 
 <!-- Package usage examples. -->
 
 <section class="examples">
 
 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var Float64Array = require( '@stdlib/array/float64' );
 var inmap = require( '@stdlib/utils/inmap' );
 var randu = require( '@stdlib/random/base/randu' );
 var sparsearray2iteratorRight = require( '@stdlib/array/to-sparse-iterator-right' );
 
 function scale( v, i ) {
     return v * (i+1);
 }
 
 // Create an array partially filled with random numbers:
 var arr = new Array( 100 );
 var i;
 for ( i = 0; i < arr.length; i += 2 ) {
     arr[ i ] = randu();
 }
 
 // Create an iterator from the array which scales iterated values:
 var it = sparsearray2iteratorRight( arr, scale );
 
 // Perform manual iteration...
 var v;
 while ( true ) {
     v = it.next();
     if ( v.done ) {
         break;
     }
     console.log( v.value );
 }
 ```
 
 </section>
 
 <!-- /.examples -->
 
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 <section class="links">
 
 [@stdlib/array/to-iterator-right]: https://www.npmjs.com/package/@stdlib/array/tree/main/to-iterator-right
 
 </section>
 
 <!-- /.links -->