I need a simple way to divide all the numbers (contained in objects) in an array by a variable in javascript (no jquery or other libraries) :
var divisor = 16;
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}];
Expected Result:
[{"x":0,"y":1},{"x":1,"y":2},{"x":2,"y":3}];
Any ideas ?
This should do it for you:
var divisor = 16;
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}];
for(var i = 0, length = array.length; i < length; i++){
array[i] = {'x':array[i].x/divisor,'y':array[i].y/divisor};
}
In case you are likely to extend the objects in the future, you might want to do it like this, instead:
for(var i = 0, length = array.length; i < length; i++){
array[i].x /= divisor; // `a[i].x /= d` is shorthand for `a[i].x = a[i].x / d`
array[i].y /= divisor;
}
This has the advantage that it doesn't overwrite array[i], saving possible other properties.
Another solution, using map and a callback:
var divisor = 16;
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}];
array = array.map(function(v){
return {x: v.x / divisor, y: v.y / divisor};
});
forEach method or don't modify v. It works in this example but map is not supposed to modify the original objects.
for :)for (var i = 0; i < array.length; i++) {
array[i]["x"] /= divisor;
array[i]["y"] /= divisor;
}
Deep divide here.
var divideBy = function(object, divider) {
if (typeof(object) == 'number') return object/divider;
for (var i in object) {
if (object.hasOwnProperty(i)) {
object[i] = divideBy(object[i], divider);
}
}
return object;
}
var obj = [{a: 16, b: 32}, {c: 0, d: 48, e: 160}];
console.log(divideBy(obj, 16));
Here it is as a function so you can re-use it. It is not limited to just 2 variables per object.
function divideArray(array, divisor) {
var i = array.length, a, k;
while (i) { // loop over each item in array
a = array[--i];
for (k in a) { // loop over each key in object
if (a.hasOwnProperty(k)) { // ignore inherited keys
a[k] = a[k] / divisor; // calculate
}
}
}
return array;
}
// use with your example
var divisor = 16;
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}];
array = divideArray(array, divisor);
Try this
var divisor = 16;
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}];
var i=0;
for(i=0;i<array.length;i++)
{
array[i]["y"]=array[i]["y"]/divisor;
array[i]["x"]=array[i]["x"]/divisor;
}
array[i]["x"]var divisor = 16;
var array = [{"x":0,"y":16},{"x":16,"y":32},{"x":32,"y":48}];
var i=0;
for(i=0;i<array.length;i++)
{
array[i]["y"]=array[i]["y"]/divisor;
array[i]["x"]=array[i]["x"]/divisor;
}
forloops.{x: 1, z: 2}?