I have a for loop that goes through a series of data. I would like to store the result of elevations[i].elevation*3.28084; in an array. Right now it only has one value outside of the loop.

     var data2 = [];


     for (var i = 0; i < elevations.length; i++) {
        data2 = elevations[i].elevation*3.28084; // convert meters to feet        
    }

I have a for loop that goes through a series of data. I would like to store the result of elevations[i].elevation*3.28084; in an array. Right now it only has one value outside of the loop.

     var data2 = [];


     for (var i = 0; i < elevations.length; i++) {
        data2 = elevations[i].elevation*3.28084; // convert meters to feet        
    }

• javascript

4 Answers 4

You need to assign to array entries, not to the array itself:

data2[i] = elevations[i].elevation*3.28084;
// --^^^

Alternately, use push:

data2.push(elevations[i].elevation*3.28084);
// --^^^^^^-------------------------------^

You want to push new items elevation[i].elevation * 3.28084 into array. However, it's more convenient to use Array.prototype.map:

var data2 = elevations.map(function (elevation) {
  return elevation.elevation * 3.28084
})

You're only assigning a value to the previously declared variable data2, use the function push instead to add new values to the array, or use the current index to add new values to that array.

var data2 = [];

for (var i = 0; i < elevations.length; i++) {
  data2.push(elevations[i].elevation * 3.28084); // convert meters to feet        
}

You have to push your result to that array like this :

var data2 = [];
     for (var i = 0; i < elevations.length; i++) {
        data2.push(elevations[i].elevation*3.28084); // convert meters to feet        
    }

Or you can insert data to that array using map :

    var data2 = elevations.map(function(value){
return value.elevation*3.28084;
}