time-to-botec

README.md (4958B)

---

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 # anyBy
 
 > Test whether at least one element in a collection passes a test implemented by a predicate function.
 
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 <section class="intro">
 
 </section>
 
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 <!-- Package usage documentation. -->
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var anyBy = require( '@stdlib/utils/any-by' );
 ```
 
 #### anyBy( collection, predicate\[, thisArg ] )
 
 Tests whether at least one element in a `collection` passes a test implemented by a `predicate` function.
 
 ```javascript
 function isNegative( value ) {
     return ( value < 0 );
 }
 
 var arr = [ 1, 2, 3, 4, -1 ];
 
 var bool = anyBy( arr, isNegative );
 // returns true
 ```
 
 If a `predicate` function returns a truthy value, the function **immediately** returns `true`.
 
 ```javascript
 function isPositive( value ) {
     if ( value < 0 ) {
         throw new Error( 'should never reach this line' );
     }
     return ( value > 0 );
 }
 
 var arr = [ 1, -2, 3, 4 ];
 
 var bool = anyBy( arr, isPositive );
 // 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 = [ 1, 2, 3, 4, -5 ];
 
 var context = {
     'sum': 0,
     'count': 0
 };
 
 var bool = anyBy( arr, sum, context );
 // returns true
 
 var mean = context.sum / context.count;
 // returns 1.0
 ```
 
 </section>
 
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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 = anyBy( [], alwaysTrue );
     // returns false
     ```
 
 -   The function differs from [`Array.prototype.some`][mdn-array-some] in the following ways:
 
     -   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, , , 4, -1 ];
 
         var bool = anyBy( arr, log );
         /* =>
             0: 1
             1: undefined
             2: undefined
             3: 4
             4: -1
         */
         ```
 
     -   The function provides limited support for dynamic collections (i.e., collections whose `length` changes during execution).
 
 </section>
 
 <!-- /.notes -->
 
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 <section class="examples">
 
 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var randu = require( '@stdlib/random/base/randu' );
 var anyBy = require( '@stdlib/utils/any-by' );
 
 function threshold( value ) {
     return ( value > 0.95 );
 }
 
 var bool;
 var arr;
 var i;
 
 arr = [];
 for ( i = 0; i < 100; i++ ) {
     arr.push( randu() );
 }
 
 bool = anyBy( arr, threshold );
 // returns <boolean>
 ```
 
 </section>
 
 <!-- /.examples -->
 
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 <section class="references">
 
 </section>
 
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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
 
 [mdn-array-some]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some
 
 </section>
 
 <!-- /.links -->