Loop through array, set property of each element?

Question

Okay, very simple: there is an array containing 3 objects. Each object has a unique property called "ID" with values of either 1, 2, or 3.

One of the objects gets deleted.

The objective now is to update the ID property of each object corresponding to the new array.length value.

So for example, the object with ID of 2 got deleted. The remaining objects in the array would each have ID values of 1 and 3 respectively.

So the objective is to loop through the array and update the ID properties to 1, and 2 (instead of 1 and 3).

So I guess the question is how to write a loop to update a common property of each element in an array. Thanks.

weltraumpirat · Accepted Answer · 2011-12-10 00:45:58Z

2

You can use a for-loop to go through the array, as in walkietokyo's answer, or you can use a method closure:

myArray.forEach ( function ( item:*, i:int, arr:Array) : void { item.ID = i; } );

or a while-loop:

var i:int = -1;
while (++i < myArray.length) myArray[i].ID = i;

answered Dec 10, 2011 at 0:45

weltraumpirat

22.6k5 gold badges43 silver badges54 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

david.emilsson · Accepted Answer · 2011-12-10 00:16:54Z

0

for (var i:uint = 1; i <= myArray.length; i++) {
    myArray[i].ID = i;
}

General info on loops: http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WS5b3ccc516d4fbf351e63e3d118a9b90204-7fcf.html

answered Dec 10, 2011 at 0:16

david.emilsson

2,3211 gold badge21 silver badges25 bronze badges

Comments

Justin · Accepted Answer · 2013-12-11 17:15:38Z

0

var i:uint; // for speed keep out of the loop
var arrayLength = myArray.length // for speed keep out of the loop

for (i = 0; i < arrayLength; i++) {
    myArray[i].ID = i;
}

answered Dec 11, 2013 at 17:15

Justin

2251 silver badge10 bronze badges

Collectives™ on Stack Overflow

Loop through array, set property of each element?

3 Answers 3

Comments

Comments

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Linked

Related