69 lines
1.8 KiB
Plaintext
69 lines
1.8 KiB
Plaintext
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{{alias}}( obj, [options,] indicator )
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Group values according to an indicator function.
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When invoked, the indicator function is provided two arguments:
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- `value`: object value
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- `key`: object key
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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 object, the function returns an empty object.
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The function iterates over an object's own properties.
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Key iteration order is *not* guaranteed, and, thus, result order is *not*
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guaranteed.
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Parameters
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----------
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obj: Object|Array|TypedArray
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Input object to group.
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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 `keys`, keys are returned; if `*`,
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both keys and values are returned. Default: 'values'.
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indicator: Function
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Indicator function indicating which group a value in the input object
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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 obj = { 'a': 'beep', 'b': 'boop', 'c': 'foo', 'd': 'bar' };
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> var out = {{alias}}( obj, indicator )
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{ 'b': [ 'beep', 'boop', 'bar' ], 'other': [ 'foo' ] }
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// Output group results as keys:
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> var opts = { 'returns': 'keys' };
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> out = {{alias}}( obj, opts, indicator )
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{ 'b': [ 'a', 'b', 'd' ], 'other': [ 'c' ] }
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// Output group results as key-value pairs:
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> opts = { 'returns': '*' };
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> out = {{alias}}( obj, opts, indicator )
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{ 'b': [['a','beep'], ['b','boop'], ['d','bar']], 'other': [['c','foo' ]] }
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See Also
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--------
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