I have a for loop which returns an array.
Return:
1st loop:
arr[0]
arr[1]
arr[2]
arr[3]
Here the length I get is 4 (Not a problem).
Return:
2nd loop
arr[4]
arr[5]
arr[6]
arr[7]
arr[8]
Here the length I get is 9.
What I want here is the actual count of the indexes i.e I need it to be 5. How can I do this. And is there a way that when I enter each loop every time it starts from 0 so that I get proper length in all the loops?
This is easily done natively using Array.filter:
resetArr = orgArr.filter(function(){return true;});
You could just copy all the elements from the array into a new array whose indices start at zero.
E.g.
function startFromZero(arr) {
var newArr = [];
var count = 0;
for (var i in arr) {
newArr[count++] = arr[i];
}
return newArr;
}
// messed up array
x = [];
x[3] = 'a';
x[4] = 'b';
x[5] = 'c';
// everything is reordered starting at zero
x = startFromZero(x);
Easy,
var filterd_array = my_array.filter(Boolean);
Perhaps "underscore.js" will be useful here.
The _.compact() function returns a copy of the array with no undefined.
