useful-util v0.0.4
useful-util
useful functions i never really know where to put
Installation
Install with component(1):
$ component install muigui/useful-util
Install with npm:
$ npm install useful-util
API
bless( namespace:String, context:Object ):Object
Creates an Object representation of the passed namespace
String and returns it.
If a context
Object is given, the Object tree created will be added to the context
Object, otherwise it will be added to the global namespace.
NOTE: If any existing Objects with the same name already exist, they will NOT be replaced and any child Objects will be appended to them.
Example:
var util = require( 'useful-util' );
// util.ENV == 'browser'
util.bless( 'foo.bar' ); // creates => global.foo.bar
// you can now do:
foo.bar.Something = function() {};
util.bless( 'foo.bar', util ); // creates => util.foo.bar
var bar = util.bless( 'foo.bar' );
bar === foo.bar // returns => true
IMPORTANT: When using util.bless
within a commonjs module: if you want your namespace Object to be assigned to the correct module.exports
, then you should always pass the module
instance as the context (ctx
) of your namespace.
Example:
var util = require( 'useful-util' );
// util.ENV == 'commonjs'
// inside my_commonjs_module.js
util.bless( 'foo.bar', module ); // creates => module.exports.foo.bar
// you can now do:
module.exports.foo.bar.Something = function() {};
// if you want to include "exports" in your namespace, you can do so by placing a carat (^) at the start of the String
util.bless( '^exports.foo.bar', module ); // creates => module.exports.foo.bar
// otherwise, you will end up creating an extra exports Object, e.g:
util.bless( 'exports.foo.bar', module ); // creates => module.exports.exports.foo.bar
// alternatively, you can also do:
util.bless( 'foo.bar', module.exports ); // creates => module.exports.foo.bar
coerce( item:Mixed ):Mixed
Attempts to coerce primitive values "trapped" in Strings, into their real types.
Example:
var util = require( 'useful-util' );
util.coerce( 'false' ); // returns false
util.coerce( 'null' ); // returns null
util.coerce( 'true' ); // returns true
util.coerce( 'undefined' ); // returns undefined
util.coerce( 'NaN' ); // returns NaN
util.coerce( '0001' ); // returns 1
util.coerce( '0012' ); // returns 12
util.coerce( '0123' ); // returns 123
util.coerce( '123.4' ); // returns 123.4
util.coerce( '123.45' ); // returns 123.45
util.coerce( '123.456' ); // returns 123.456
util.coerce( '123.456.789' ); // returns "123.456.789"
copy( target:Object, source:Object, no_overwrite:Boolean ):Object
Copies the properties – accessible via Object.keys
– from the source
Object to the target
Object and returns the target
Object.
Example:
var util = require( 'useful-util' );
var foo = { one : 1, two : 2, three : 3 },
bar = util.copy( {}, foo );
bar // returns => { "one" : 1, "two" : 2, "three" : 3 }
foo === bar // returns => false
util.copy( foo, { three : 3.3, four : 4 }, true ); // returns => { "one" : 1, "two" : 2, "three" : 3, "four" : 4 }
empty( value:Mixed ):Boolean
Returns true
if the passed value
does not exist (see exist
below), is an empty Array, Object, String or any other enumerable type.
Example:
var util = require( 'useful-util' );
util.empty( undefined ); // returns => true
util.empty( null ); // returns => true
util.empty( '' ); // returns => true
util.empty( [] ); // returns => true
util.empty( {} ); // returns => true
util.empty( ' ' ); // returns => false
util.empty( [1] ); // returns => false
util.empty( { 0 : null } ); // returns => false
exists( value:Mixed ):Boolean
Returns false
if the passed value
is undefined
, NaN
or null
, returns true
otherwise.
Example:
var util = require( 'useful-util' );
util.exists( undefined ); // returns => false
util.exists( NaN ); // returns => false
util.exists( null ); // returns => false
util.exists( 0 ); // returns => true
util.exists( false ); // returns => true
util.exists( {} ); // returns => true
format( tpl:String, arg1:String, arg2:String, ..., argN:String ):String
Replaces the – zero indexed – numeric tokens in the String with the passed parameters.
If a token does not have a value, an empty String is used in its place.
NOTE: format
calls interpolate
internally.
Example:
var util = require( 'useful-util' );
util.format( '{0} {1} {2} {3}', 'lorem', 'ipsum', 'dolor' ) // returns => "lorem ipsum dolor "
interpolate( tpl:String, dictionary:String[]|String{}, pattern:RegExp ):String
Replaces the tokens in the String with the values of the corresponding properties from the passed dictionary
Object.
Also accepts an optional second parameter allowing you to define your own token matching pattern
.
If a token does not have a value, an empty String is used in its place.
Example:
var util = require( 'useful-util' );
util.interpolate( '{one} {two} {three} {four}', { one : 'lorem', two : 'ipsum', three : 'dolor' } ) // returns => "lorem ipsum dolor "
guid():String
Generates a guid/uuid, the code for this was adapted from this gist.
var util = require( 'useful-util' );
util.guid(); // returns something like => "286cb768-df10-4466-aabf-f5cb4ba406a2"
id( item:Mixed, prefix:String ):String
Returns the id
property of the passed item – item can be an Object, HTMLElement, "JavaScript Class" instance, etc...
If an id
does not exist on the passed item
, the item is assigned an auto-generated id
and the value is returned.
If a prefix
is supplied then it is used as the prefix for the id
– if not anon
is used as the prefix
.
An internal counter that is automatically incremented is appended to the end of the prefix
and is separated from the prefix by a hyphen.
Example:
var util = require( 'useful-util' );
var foo = { id : 'foo' },
bar = { name : 'bar' },
yum = { nam : 'yum' };
util.id( foo ); // returns => "foo"
util.id( bar ); // returns => "anon-1000"
util.id( yum, 'yum' ); // returns => "yum-1001"
iter( item:Mixed ):Boolean
Returns true
if the passed item can be iterated over.
k( item:Mixed ):Mixed
A Function which returns the the first parameter passed to it.
Example
var util = require( 'useful-util' );
util.k( true ); // returns => true
util.k( 'foo' ); // returns => "foo"
util.k( { foo : 'bar' } ); // returns => { "foo" : "bar" }
len( item:Mixed ):Number
Tries the returns the length
property of the passed item
.
Example:
var util = require( 'useful-util' );
util.len( { one : 1, two : 2, three : 3 } ); // returns => 3
util.len( [1, 2, 3] ); // returns => 3
util.len( 'foobar' ); // returns => 6
util.len( { one : 1, two : 2, three : 3 } ) === Object.keys( { one : 1, two : 2, three : 3 } ).length
// returns => true
merge( target:Array|Object, source:Array|Object ):Boolean
Performs a "deep copy" of all the properties in source
to target
, so that target
does not reference any child Arrays and/ or Objects that belong to source
.
noop():void
An empty Function that returns nothing.
range( begin:Number|String, end:Number|String ):Array
Returns an Array starting at begin
where each value is incremented by 1
until end
is reached.
Example:
var util = require( 'useful-util' );
util.range( 1, 10 ); // returns => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
util.range( 20, 1000 ); // returns => [20, 21, 22, ..., 1000]
util.range( 'A', 'z' ); // returns => ['A', 'B', 'C', ..., 'x', 'y', 'z']
util.range( 'α', 'ω' ); // returns => ['α', 'β', 'γ', ..., 'χ', 'ψ', 'ω']
NOTE: Only the first character will be incremented in a String
range.
remove( item:Array, value_or_index1:Number|Mixed|Number[]|Mixed ):item
remove( item:Object, property1:String|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.
Example:
var util = require( 'useful-util' );
var foo_arr = ['one', 'two', 'three'],
foo_obj = { one : 1, two : 2, three : 3 };
util.remove( foo_arr, 'one', 'three' ); // returns => ['two']
util.remove( foo_arr, ['one', 'three'] ); // same as above
util.remove( foo_arr, 0, 2 ); // same as above
util.remove( foo_arr, [0, 2] ); // same as above
util.remove( foo_obj, 'one', 'three' ); // returns => { two : 2 }
util.remove( foo_obj, ['one', 'three'] ); // same as above
update( target:Array|Object, source:Array|Object ):Boolean
Performs a "deep copy" of all the properties in source
that are not already contained in target
, so that target
does not reference any child Arrays and/ or Objects that belong to source
.
This works similarly to util.merge
except that existing properties are not overwritten.
value( object:Object, path:String ):Mixed
Returns the property value at the specified path in an Object.
Example:
var util = require( 'useful-util' );
var data = { one : { two : { three : true, four : [1, 2, 3, 4] } } };
util.value( data, 'one' ); // returns => { two : { three : true, four : [1, 2, 3, 4] } }
util.value( data, 'one.two' ); // returns => { three : true, four : [1, 2, 3, 4] }
util.value( data, 'one.two.three' ); // returns => { three : true }
util.value( data, 'one.two.four' ); // returns => [1, 2, 3, 4]
util.value( data, 'one.two.four.2' ); // returns => 3
License
(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.