time-to-botec

README.md (4882B)

---

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 @license Apache-2.0
 
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 See the License for the specific language governing permissions and
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 # Deep Pluck
 
 > Extract a nested property value from each element of an object array.
 
 <section class="intro">
 
 </section>
 
 <!-- /.intro -->
 
 <section class="usage">
 
 ## Usage
 
 ```javascript
 var deepPluck = require( '@stdlib/utils/deep-pluck' );
 ```
 
 #### deepPluck( arr, path\[, options] )
 
 Extracts a nested property value from each element of an object `array` based on a key `path`.
 
 <!-- eslint-disable object-curly-newline, object-curly-spacing -->
 
 ```javascript
 var arr = [
     { 'a': { 'b': { 'c': 1 } } },
     { 'a': { 'b': { 'c': 2 } } }
 ];
 
 var out = deepPluck( arr, 'a.b.c' );
 // returns [ 1, 2 ]
 ```
 
 A key `path` may be specified as either a `string` or as an `array`.
 
 <!-- eslint-disable object-curly-newline, object-curly-spacing -->
 
 ```javascript
 var arr = [
     { 'a': [ 0, 1, 2 ] },
     { 'a': [ 3, 4, 5 ] }
 ];
 
 var out = deepPluck( arr, [ 'a', 1 ] );
 // returns [ 1, 4 ]
 ```
 
 The function accepts the following `options`:
 
 -   **copy**: `boolean` indicating whether to return a new data structure. Default: `true`.
 -   **sep**: key path [separator][@stdlib/utils/deep-get]. Default: `'.'`.
 
 By default, the function returns a new data structure. To mutate the input data structure (e.g., when input values can be discarded or when optimizing memory usage), set the `copy` option to `false`.
 
 <!-- eslint-disable object-curly-newline, object-curly-spacing -->
 
 ```javascript
 var arr = [
     { 'a': { 'b': { 'c': 1 } } },
     { 'a': { 'b': { 'c': 2 } } }
 ];
 
 var out = deepPluck( arr, 'a.b.c', { 'copy': false } );
 // returns [ 1, 2 ]
 
 var bool = ( arr[ 0 ] === out[ 0 ] );
 // returns true
 ```
 
 The default key `path` separator is `.`. To specify an alternative separator, set the `sep` option.
 
 <!-- eslint-disable object-curly-newline, object-curly-spacing -->
 
 ```javascript
 var arr = [
     { 'a': { 'b': { 'c': 1 } } },
     { 'a': { 'b': { 'c': 2 } } }
 ];
 
 var out = deepPluck( arr, 'a|b|c', { 'sep': '|' } );
 // returns [ 1, 2 ]
 ```
 
 </section>
 
 <!-- /.usage -->
 
 <section class="notes">
 
 -   If a key path does **not** exist, the function sets the plucked value as `undefined`.
 
     <!-- eslint-disable object-curly-newline, object-curly-spacing -->
 
     ```javascript
     var arr = [
         { 'a': { 'b': { 'c': 1 } } },
         null,
         void 0,
         { 'a': { 'b': { 'c': 2 } } }
     ];
 
     var out = deepPluck( arr, 'a.b.c' );
     // returns [ 1, undefined, undefined, 2 ]
     ```
 
 -   Extracted values are **not** cloned.
 
     <!-- eslint-disable object-curly-newline, object-curly-spacing -->
 
     ```javascript
     var arr = [
         { 'a': { 'b': { 'c': 2 } } },
         { 'a': { 'b': { 'c': 3 } } }
     ];
 
     var out = deepPluck( arr, 'a.b' );
     // returns [ { 'c': 2 }, { 'c': 3 } ]
 
     var bool = ( arr[ 0 ].a.b === out[ 0 ] );
     // returns true
     ```
 
     To prevent subsequent unintended mutation, use [copy][@stdlib/utils/copy].
 
     <!-- eslint-disable object-curly-newline, object-curly-spacing -->
 
     ```javascript
     var copy = require( '@stdlib/utils/copy' );
 
     var arr = [
         { 'a': { 'b': { 'c': 2 } } },
         { 'a': { 'b': { 'c': 3 } } }
     ];
 
     var out = deepPluck( arr, 'a.b' );
     // returns [ { 'c': 2 }, { 'c': 3 } ]
 
     // Perform a deep copy:
     out = copy( out );
 
     var bool = ( arr[ 0 ].a.b === out[ 0 ] );
     // returns false
     ```
 
 </section>
 
 <!-- /.notes -->
 
 <section class="examples">
 
 ## Examples
 
 <!-- eslint no-undef: "error" -->
 
 ```javascript
 var randu = require( '@stdlib/random/base/randu' );
 var round = require( '@stdlib/math/base/special/round' );
 var deepPluck = require( '@stdlib/utils/deep-pluck' );
 
 var arr;
 var out;
 var tmp;
 var i;
 
 arr = new Array( 100 );
 for ( i = 0; i < arr.length; i++ ) {
     tmp = {
         'a': {
             'b': {
                 'c': {
                     'd': null
                 }
             }
         }
     };
     tmp.a.b.c.d = round( randu()*100.0 );
     arr[ i ] = tmp;
 }
 
 // Pluck the deeply nested values:
 out = deepPluck( arr, 'a.b.c.d' );
 console.log( out );
 ```
 
 </section>
 
 <!-- /.examples -->
 
 <section class="links">
 
 [@stdlib/utils/deep-get]: https://www.npmjs.com/package/@stdlib/utils/tree/main/deep-get
 
 [@stdlib/utils/copy]: https://www.npmjs.com/package/@stdlib/utils/tree/main/copy
 
 </section>
 
 <!-- /.links -->