deac/jquery
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

jQuery.map to iterate over objects with a .length property

Browse source
This commit is contained in:
Dan Heberden 2011-03-21 12:12:31 -07:00
parent e38f074d14
commit d832f4f71e
2 changed files with 27 additions and 25 deletions
Download patch file Download diff file Expand all files Collapse all files

40
src/core.js
View file

@ -704,33 +704,33 @@ jQuery.extend({
return ret;
},
// arg is for internal usage only
// arg is for internal usage only
map: function( elems, callback, arg ) {
var ret = [], value, i = 0,
length = elems.length,
// same object detection used in jQuery.each, not full-proof but very speedy.
isObj = length === undefined;
// the work for the loops - run elems[x] through callback
inLoop = function( key ) {
value = callback( elems[ key ], key, arg );
var value, ret = [],
i = 0,
length = elems.length,
// process .length if it's just an object member
isArray = length !== undefined && ( elems[ length - 1 ] || jQuery.isArray( elems ) );
// Go through the array, translating each of the items to their
// new value (or values).
if ( isArray ) {
for ( ; i < length; i++ ) {
value = callback( elems[ i ], i, arg );
if ( value != null ) {
ret[ ret.length ] = value;
}
}
// Go thorugh every key on the object
if ( isObj ) {
// Go thorugh every key on the object,
} else {
for ( key in elems ) {
inLoop( key );
}
// Go through the array, translating each of the items to their
// new value (or values).
} else {
for ( ; i < length; i++ ) {
inLoop( i );
value = callback( elems[ key ], key, arg );
if ( value != null ) {
ret[ ret.length ] = value;
}
}
}