I have an ajax call which returns same data
obj[0],obj[1],obj[2],obj[3],obj[4],obj[5],obj[6],obj[7],obj[8],obj[9],obj[10],obj[11]....
So i want to take only obj[0]-obj[3] and obj[4]-obj[7] and obj[8]-obj[11]...
var iterate=0;
for(i=0 ;i<obj.length ; i++)
{
alert(obj[iterate].mydata);
iterate=iterate+3;
}
here the issue is , it iterates each time so i cant get valjue of obj[4] after obj[3] Any idea ?
Continously splicing the array would be easier:
var array = [1,2,3,4,5,6,7,8,9,10];
var slices = [];
while( array.length > 0 )
slices.push( array.splice(0,3) );
console.log( slices );
.slice would only be a small step.
for(i=0; i<array.length-1; i++) array.unshift( array.splice(i,3) ); be any less expensive?The following code takes three elements at each interation:
var array = [1,2,3,4,5,6,7,8,9,10];
for (var a = 0; a < array.length; a += 3) {
// On the last iteration, array[a+1] and array[a+2]
// will be undefined, because array is of length 10,
// and 10 isn't divisible by 3 without a remainder.
console.log(array[a], array[a+1], array[a+2]);
}
Also, in your question you're using i and iterate interchangeably in your code.
I think a nested loop will help you. Like this:
for(i=0 ;i<obj.length ; i+=4) { // << step must be 4, not 3
for (j=0; (j<=3) && (i+j < obj.length); j++) {
alert(obj[i + j].mydata); // << here you take 0-3, 4-7 etc.
}
}
EDIT: termination in outer loop corrected
iterate > obj.length - 4, which will happen after obj.length / 4 iterations (I think).
objsupposed to be an array or what? Are you trying to split an array into chunks? I don't see what the difference would be betweenobj[0]-obj[3] and obj[4]-obj[7]and justobj[0]-obj[7]. Please provide a concrete example of the input and output you (want to) get. The better you describe your problem, the easier it is for us to help you.I want to take only ...only what? obj[0] minus obj[3]? Or the sum of obj[0] to obj[3]? You're talking in rebuses. You may also want to slice the original array into smaller arrays, etc. The point is, you have to explain your problem and expected solution in a way so we understand it.