time-to-botec

README.md (4978B)

---

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 # someByRight
 
 > Test whether a collection contains at least `n` elements which pass a test implemented by a predicate function, iterating from right to left.
 
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 </section>
 
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 <!-- Package usage documentation. -->
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var someByRight = require( '@stdlib/utils/some-by-right' );
 ```
 
 #### someByRight( collection, n, predicate\[, thisArg ] )
 
 Tests whether a `collection` contains at least `n` elements which pass a test implemented by a `predicate` function, iterating from right to left.
 
 ```javascript
 function isNegative( value ) {
     return ( value < 0 );
 }
 
 var arr = [ -1, 1, -2, 3, 4 ];
 
 var bool = someByRight( arr, 2, isNegative );
 // returns true
 ```
 
 Once the function finds `n` successful elements, the function **immediately** returns `true`.
 
 ```javascript
 function isNegative( value ) {
     if ( value > 0 ) {
         throw new Error( 'should never reach this line' );
     }
     return ( value < 0 );
 }
 
 var arr = [ -1, 2, -3, -4 ];
 
 var bool = someByRight( arr, 2, isNegative );
 // returns true
 ```
 
 The invoked `function` is provided three arguments:
 
 -   `value`: collection element
 -   `index`: collection index
 -   `collection`: input collection
 
 To set the function execution context, provide a `thisArg`.
 
 ```javascript
 function sum( value ) {
     this.sum += value;
     this.count += 1;
     return ( value < 0 );
 }
 
 var arr = [ -5, 1, 2, 3, 4 ];
 
 var context = {
     'sum': 0,
     'count': 0
 };
 
 var bool = someByRight( arr, 1, sum, context );
 // returns true
 
 var mean = context.sum / context.count;
 // returns 1.0
 ```
 
 </section>
 
 <!-- /.usage -->
 
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 <section class="notes">
 
 ## Notes
 
 -   A `collection` may be either an [`Array`][mdn-array], [`Typed Array`][mdn-typed-array], or an array-like [`Object`][mdn-object] (excluding `strings` and `functions`).
 
 -   If provided an empty collection, the function returns `false`.
 
     ```javascript
     function alwaysTrue() {
         return true;
     }
     var bool = someByRight( [], 1, alwaysTrue );
     // returns false
     ```
 
 -   The function does **not** skip `undefined` elements.
 
     <!-- eslint-disable no-sparse-arrays, stdlib/doctest-marker -->
 
     ```javascript
     function log( value, index ) {
         console.log( '%s: %s', index, value );
         return ( value < 0 );
     }
 
     var arr = [ -1, 1, , , 4 ];
 
     var bool = someByRight( arr, 1, log );
     /* =>
         4: 4
         3: undefined
         2: undefined
         1: 1
         0: -1
     */
     ```
 
 -   The function provides limited support for dynamic collections (i.e., collections whose `length` changes during execution). Note, however, that index incrementation is **not** guaranteed to be monotonically **decreasing**.
 
 </section>
 
 <!-- /.notes -->
 
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 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var randu = require( '@stdlib/random/base/randu' );
 var someByRight = require( '@stdlib/utils/some-by-right' );
 
 function threshold( value ) {
     return ( value > 0.95 );
 }
 
 var bool;
 var arr;
 var i;
 
 arr = new Array( 100 );
 for ( i = 0; i < arr.length; i++ ) {
     arr[ i ] = randu();
 }
 
 bool = someByRight( arr, 5, threshold );
 // returns <boolean>
 ```
 
 </section>
 
 <!-- /.examples -->
 
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 [mdn-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
 
 [mdn-typed-array]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray
 
 [mdn-object]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object
 
 </section>
 
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