useful functions for working with Arrays and Objects
npm install useful-iteruseful functions for working with Arrays and Objects
Install with component(1):
$ component install muigui/useful-iter
Install with npm:
$ npm install useful-iter
true if the passed item can be iterated over.Unlike reduce, you can also supply an optional context Object to aggregate.
aggregate will work on any iterable Object, so Array, Arguments, Function, HTMLCollection, NodeList, Object, etc.
If no context Object is supplied, the item being iterated over will be used as the context Object.
The iterator Function will receive 5 arguments:
| argument | type | description |
|---|---|---|
| accumulator | When the iterator Function is first called, this will be the initially supplied accumulator, after which it will be previous value returned by the iterator Function. | |
| value | The current item in the iteration. | |
| index_or_key | The current index:Number or key:String corresponding to the current value in the iteration. | |
| item | The item being iterated over. |
#### Example:
``javascript
var iter = require( 'useful-iter' );
iter.aggregate( { one : 1, two : 2, three : 3 }, [], function( accumulator, value, key ) {
accumulator.push( key );
return accumulator;
} ); // returns => ['one', 'two', 'three'];
iter.aggregate( { one : 1, two : 2, three : 3 }, 1, function( accumulator, value, key ) {
return accumulator += value;
} ); // returns => 7;
iter.aggregate( iter.range( 0, 10 ), 0, function( accumulator, value, index ) {
return accumulator += ( value * index );
} ); // returns => 385;
`
if both a and b deeply equal each other, false otherwise.#### Example:
`javascript var copy = require( 'useful-copy' ),
iter = require( 'useful-iter' );
var foo = { one : 1, two : 2, three : 3 },
bar = copy( {}, foo );
iter.equal( foo, bar ); // returns => true
bar.four = 4;
iter.equal( foo, bar ); // returns => false
`$3
Tries the returns the property of the passed item.#### Example:
`javascript var iter = require( 'useful-iter' );
iter.len( { one : 1, two : 2, three : 3 } ); // returns => 3
iter.len( [1, 2, 3] ); // returns => 3
iter.len( 'foobar' ); // returns => 6
iter.len( { one : 1, two : 2, three : 3 } ) === Object.keys( { one : 1, two : 2, three : 3 } ).length
// returns => true
`$3
Returns an Array starting at where each value is incremented by 1 until end is reached.#### Example:
`javascript var iter = require( 'useful-iter' );
iter.range( 1, 10 ); // returns => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
iter.range( 20, 1000 ); // returns => [20, 21, 22, ..., 1000]
iter.range( 'A', 'z' ); // returns => ['A', 'B', 'C', ..., 'x', 'y', 'z']
iter.range( 'α', 'ω' ); // returns => ['α', 'β', 'γ', ..., 'χ', 'ψ', 'ω']
`NOTE: Only the first character will be incremented in a
range.$3
$3
Removes items from the passed Array or Object and returns the passed Array or Object.If removing items from an Array, you can either pass the index of the item you want to remove or the item itself.
If removing items from an Object, you simply pass the key of the item you want to remove.
#### Example:
`javascript var iter = require( 'useful-iter' );
var foo_arr = ['one', 'two', 'three'],
foo_obj = { one : 1, two : 2, three : 3 };
iter.remove( foo_arr, 'one', 'three' ); // returns => ['two']
iter.remove( foo_arr, ['one', 'three'] ); // same as above
iter.remove( foo_arr, 0, 2 ); // same as above
iter.remove( foo_arr, [0, 2] ); // same as above
iter.remove( foo_obj, 'one', 'three' ); // returns => { two : 2 }
iter.remove( foo_obj, ['one', 'three'] ); // same as above
``(The MIT License)
Copyright (c) 2011 christos "constantology" constandinou http://muigui.com
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.