Hi I need to create a load of variables in a javascript loop so say my loop goes round 5 times starting at 0 by the end of it the following variables should be defined:
variable_0
variable_1
variable_2
variable_3
variable_4
Can anyone tell me how to do this please?
This will create "global" variables by registering them on the window object:
for (var i = 0; i != 5; ++i) {
window['variable_' + i] = null;
}
It's not really nice to do that though =/ a better way is to define an object in which you create dynamic properties.
var obj = {}
for (var i = 0; i != 5; ++i) {
obj['variable_' + i] = null;
}
console.log(obj.variable_0); // null
Why not just use an array:
var variable = [];
If you really want to create 5 variables, you need to choose the scope of them, the easiest is probably window, then you can use the sqare bracket syntax:
for(var i=0;i<5; i++){
window["variable_" + i] = 0; // or anything really!
}
Now the following variable is available:
window.variable_1 = 123
You can only create variably named variables as part of an Object:
obj['variable_' + i] = value;
There's no equivalent for function scoped variables, although you can of course do:
function foo() {
var obj = {};
for (var i = 0; ... ) {
obj['variable_' + i] = value;
}
}
You can fake global variables (but shouldn't) by using the window global object in place of obj, as shown by @Jack.
Of course in most circumstances (and since you're using numbers to differentiate the variables) what you should really do is use an array:
var myvar = [];
for (var i = 0; i < n; ++i) {
myvar[i] = ...;
}
