useful functions for working with Arrays and Objects
Install with component(1):
$ component install muigui/useful-iter
Install with npm:
$ npm install useful-iter
Returns true if the passed item can be iterated over.
Works similar to Array.prototype.reduce.
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. |
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;Returns true if both a and b deeply equal each other, false otherwise.
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 => falseExecutes the passed method — NOTE: method is a String, and should be the name of method that exists on each item in the Array — passing any extra arguments to each method call.
iter.invoke( ['lorem', 'ipsum', 'dolor', 'sit', 'amet'], 'toUpperCase' ); // returns => ["LOREM", "IPSUM", "DOLOR", "SIT", "AMET"]
iter.invoke( [1, 2, 3, 4, 5, 6, 7, 8] 'toString', 2 ); // returns => ['1', '10', '11', '100', '101', '110', '111', '1000']Tries the returns the length property of the passed item.
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 => trueReturns a new Array where all the items are the values of the passed property key.
If only_existing is set to true then all null and undefined values will be omitted from the returned Array.
NOTEL if you want to get at properties deeper than one level down, you can simply supply the.correct.path.
var data = [{ data : { value : 'foo' } }, { data : { value : 'bar' } }, {}, { value : 'blim' }, { data : { value : 'blam' } }];
// harder to read
iter.pluck( iter.pluck( data, 'data' ), 'value' ); // returns => ["foo", "bar", undefined, undefined, "blam"]
// easier on the eye
iter.pluck( data, 'data.value' ); // returns => ["foo", "bar", undefined, undefined, "blam"]
// return only existing values
iter.pluck( data, 'data.value', true ); // returns => ["foo", "bar", "blam"]Returns an Array starting at begin where each value is incremented by 1 until end is reached.
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 String range.
iter.remove( item:Array, value_or_index1:Number|Mixed|Number[]|Mixed[][, value_or_index2:Number|Mixed, ..., value_or_indexN:Number|Mixed] ):item
iter.remove( item:Object, property1:String|String[][, property2:String, ..., propertyN:String] ):item
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.
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.
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