65 lines
1.8 KiB
Plaintext
65 lines
1.8 KiB
Plaintext
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{{alias}}( collection, [options,] indicator )
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Groups values according to an indicator function.
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When invoked, the indicator function is provided two arguments:
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- `value`: collection value
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- `index`: collection index
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The value returned by an indicator function should be a value which can be
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serialized as an object key.
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If provided an empty collection, the function returns an empty object.
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Parameters
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----------
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collection: Array|TypedArray|Object
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Input collection to group. If provided an object, the object must be
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array-like (excluding strings and functions).
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options: Object (optional)
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Options.
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options.thisArg: any (optional)
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Execution context.
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options.returns: string (optional)
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If `values`, values are returned; if `indices`, indices are returned; if
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`*`, both indices and values are returned. Default: 'values'.
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indicator: Function
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Indicator function specifying which group an element in the input
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collection belongs to.
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Returns
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-------
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out: Object
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Group results.
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Examples
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--------
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> function indicator( v ) {
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... if ( v[ 0 ] === 'b' ) {
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... return 'b';
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... }
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... return 'other';
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... };
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> var collection = [ 'beep', 'boop', 'foo', 'bar' ];
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> var out = {{alias}}( collection, indicator )
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{ 'b': [ 'beep', 'boop', 'bar' ], 'other': [ 'foo' ] }
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// Output group results as indices:
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> var opts = { 'returns': 'indices' };
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> out = {{alias}}( collection, opts, indicator )
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{ 'b': [ 0, 1, 3 ], 'other': [ 2 ] }
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// Output group results as index-value pairs:
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> opts = { 'returns': '*' };
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> out = {{alias}}( collection, opts, indicator )
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{ 'b': [ [0, 'beep'], [1, 'boop'], [3, 'bar'] ], 'other': [ [2, 'foo' ] ] }
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See Also
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--------
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