time-to-botec

README.md (7334B)

---

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 # arrayview2iteratorRight
 
 > Create an iterator from an array-like object view, iterating from right to left.
 
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 <!-- Package usage documentation. -->
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var arrayview2iteratorRight = require( '@stdlib/array/to-view-iterator-right' );
 ```
 
 #### arrayview2iteratorRight( src\[, begin\[, end]]\[, mapFcn\[, thisArg]] )
 
 Returns an iterator which iterates from right to left over each element in an array-like `object` view.
 
 ```javascript
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ] );
 // returns <Object>
 
 var v = it.next().value;
 // returns 4
 
 v = it.next().value;
 // returns 3
 
 v = it.next().value;
 // returns 2
 
 // ...
 ```
 
 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.
 
 The `begin` and `end` arguments define the starting (inclusive) and ending (non-inclusive) indices of the array view. By default, the returned iterator starts iterating from the last element in an array-like `object` (i.e., from the "end"). To specify an alternative view end, provide an `end` argument (non-inclusive).
 
 ```javascript
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ], 0, 3 );
 // returns <Object>
 
 var v = it.next().value;
 // returns 3
 
 v = it.next().value;
 // returns 2
 
 v = it.next().value;
 // returns 1
 
 var bool = it.next().done;
 // returns true
 ```
 
 If `end` is less than `0`, the first iterated value is resolved relative to the last view element. For example, the following generates the same behavior as in the previous example
 
 ```javascript
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ], 0, -1 );
 // returns <Object>
 
 var v = it.next().value;
 // returns 3
 
 v = it.next().value;
 // returns 2
 
 v = it.next().value;
 // returns 1
 
 var bool = it.next().done;
 // returns true
 ```
 
 By default, the returned iterator iterates through the first element in an array-like `object` view. To specify an alternative view beginning, provide a `begin` argument (inclusive).
 
 ```javascript
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ], 1 );
 // returns <Object>
 
 var v = it.next().value;
 // returns 4
 
 v = it.next().value;
 // returns 3
 
 v = it.next().value;
 // returns 2
 
 var bool = it.next().done;
 // returns true
 ```
 
 If `begin` is less than `0`, the last iterated value is resolved relative to the last view element. For example, the following generates the same behavior as in the previous example
 
 ```javascript
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ], -3 );
 // returns <Object>
 
 var v = it.next().value;
 // returns 4
 
 v = it.next().value;
 // returns 3
 
 v = it.next().value;
 // returns 2
 
 var bool = it.next().done;
 // returns true
 ```
 
 To invoke a function for each `src` value, provide a callback function.
 
 ```javascript
 function fcn( v ) {
     return v * 10.0;
 }
 
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ], fcn );
 // returns <Object>
 
 var v = it.next().value;
 // returns 40.0
 
 v = it.next().value;
 // returns 30.0
 
 v = it.next().value;
 // returns 20.0
 
 // ...
 ```
 
 The invoked function is provided four arguments:
 
 -   `value`: iterated value
 -   `index`: iterated value index
 -   `n`: iteration count (zero-based)
 -   `src`: source array-like object
 
 ```javascript
 function fcn( v, i ) {
     return v * (i+1);
 }
 
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ], fcn );
 // returns <Object>
 
 var v = it.next().value;
 // returns 16
 
 v = it.next().value;
 // returns 9
 
 v = it.next().value;
 // returns 4
 
 // ...
 ```
 
 To set the callback function execution context, provide a `thisArg`.
 
 ```javascript
 function fcn( v ) {
     this.count += 1;
     return v * 10.0;
 }
 
 var ctx = {
     'count': 0
 };
 
 var it = arrayview2iteratorRight( [ 1, 2, 3, 4 ], fcn, ctx );
 // returns <Object>
 
 var v = it.next().value;
 // returns 40.0
 
 v = it.next().value;
 // returns 30.0
 
 v = it.next().value;
 // returns 20.0
 
 var count = ctx.count;
 // returns 3
 ```
 
 </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 does **not** ignore holes. To achieve greater performance for sparse arrays, use a custom iterator.
 -   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 arrayview2iteratorRight = require( '@stdlib/array/to-view-iterator-right' );
 
 function scale( v, i ) {
     return v * (i+1);
 }
 
 // Create an array filled with random numbers:
 var arr = inmap( new Float64Array( 100 ), randu );
 
 // Create an iterator from an array view which scales iterated values:
 var it = arrayview2iteratorRight( arr, 40, 60, 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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