69 lines
2.0 KiB
Plaintext
69 lines
2.0 KiB
Plaintext
|
|
{{alias}}( obj, [options,] predicate )
|
|
Splits values into two groups according to a predicate function.
|
|
|
|
When invoked, the predicate function is provided two arguments:
|
|
|
|
- `value`: object value
|
|
- `key`: object key
|
|
|
|
If a predicate function returns a truthy value, a value is placed in the
|
|
first group; otherwise, a value is placed in the second group.
|
|
|
|
If provided an empty object with no prototype, the function returns an empty
|
|
array.
|
|
|
|
The function iterates over an object's own and inherited properties.
|
|
|
|
Key iteration order is *not* guaranteed, and, thus, result order is *not*
|
|
guaranteed.
|
|
|
|
Parameters
|
|
----------
|
|
obj: Object|Array|TypedArray
|
|
Input object to group.
|
|
|
|
options: Object (optional)
|
|
Options.
|
|
|
|
options.thisArg: any (optional)
|
|
Execution context.
|
|
|
|
options.returns: string (optional)
|
|
If `values`, values are returned; if `keys`, keys are returned; if `*`,
|
|
both keys and values are returned. Default: 'values'.
|
|
|
|
predicate: Function
|
|
Predicate function indicating which group a value in the input object
|
|
belongs to.
|
|
|
|
Returns
|
|
-------
|
|
out: Array<Array>|Array
|
|
Group results.
|
|
|
|
Examples
|
|
--------
|
|
> function Foo() { this.a = 'beep'; this.b = 'boop'; return this; };
|
|
> Foo.prototype = Object.create( null );
|
|
> Foo.prototype.c = 'foo';
|
|
> Foo.prototype.d = 'bar';
|
|
> var obj = new Foo();
|
|
> function predicate( v ) { return v[ 0 ] === 'b'; };
|
|
> var out = {{alias}}( obj, predicate )
|
|
[ [ 'beep', 'boop', 'bar' ], [ 'foo' ] ]
|
|
|
|
// Output group results as keys:
|
|
> var opts = { 'returns': 'keys' };
|
|
> out = {{alias}}( obj, opts, predicate )
|
|
[ [ 'a', 'b', 'd' ], [ 'c' ] ]
|
|
|
|
// Output group results as key-value pairs:
|
|
> opts = { 'returns': '*' };
|
|
> out = {{alias}}( obj, opts, predicate )
|
|
[ [ ['a', 'beep'], ['b', 'boop'], ['d', 'bar'] ], [ ['c', 'foo' ] ] ]
|
|
|
|
See Also
|
|
--------
|
|
|