someArray = [{name:"Ibrahim", cid:322}, {name:"Ismail", cid:423}];
As you can see above, this is simple task to do but I haven't found solid way to iterate over this array, perform some action, and later result as below
someArray = [];
So far this is what i have come trough
for (var i = 0; i < someArray.length; i++) {
someArray[i].action()
someArray.splice(0,1);
}
it just don't work as I expected. Appreciate somebody can provide me the way. Thanks
The reason it doesn't work is that you're incrementing i, but modifying the array.
The simple way is just clear out the array at the end:
for (var i = 0; i < someArray.length; i++) {
someArray[i].action();
}
someArray.splice(0,someArray.length);
but if you have to update the array on each pass
while (someArray.length) {
someArray[0].action();
someArray.splice(0,1);
}
or if it's okay to replace the array rather than emptying it:
for (var i = 0; i < someArray.length; i++) {
someArray[i].action()
}
someArray = [];
Note that in that last case, if any other variable or property is pointing to the old array, it won't get cleaned out. But if someArray is the only reference to it, then you could just assign a blank array to it.
Why not simply do
for (var i = 0; i < someArray.length; i++) {
someArray[i].action();
}
someArray = [];
Just try with:
while (someArray.length) {
someArray[0].action();
someArray.splice(0,1);
}
Or:
while (someArray.length) {
someArray.shift().action();
}
This can be done really simply, by looping over the array, then making it a blank array. Hope this was helpful!
someArray.forEach(function (person) { // Use Array#forEach to itterate
person.action(); // Call action on person (person = someArray[i] in your example)
});
someArray = []; // Now make someArray = to a blank array
wutt??
you want to modify the collection while iterating? you need to put additional logic after removing the item
you have 2 items, ibrahim and ismail
when entering the first loop (i = 0, length = 2, 0 < 2 => iterate)
ibrahim action is called
and then the ibrahim is removed
when entering the second loop (i = 1, length = 1, 1 < 1 => quit loop)
You need to decide the length first, and not count it on each iteration (it is also good for performance)
Here is a fiddle: http://jsfiddle.net/hW4Mm/22/
The magic is in this line:
var len = someArray.length;
That should work.
