var x = 10;
var y = 5;
var action = '+';
var z = x action y; //15
is it possible to assign Arithmetic operators as variables?
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Maybe with some preprocessing. In other words, when serving for web you could use server side scripting to transform the javascript code.Theraot– Theraot2014-02-16 15:43:27 +00:00Commented Feb 16, 2014 at 15:43
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3 Answers
You could just check for the actions you wanna be supporting:
var x = 10;
var y = 5;
var action = '+';
var z = null;
if (action == '+') {
z = x + y;
} else if (action == '-') {
z = x - y;
} else if (action == '*') {
z = x * y;
} else if (action == '/') {
z = x / y;
} else {
alert('Unsupported action');
}
There's also the eval function which allows you to execute some dynamic javascript statement but its use is often frowned upon:
var x = 10;
var y = 5;
var action = '+';
var z = window.eval(x + action + y);
1 Comment
Jesse
a switch case might be neater
It is not possible using that syntax. The simplest way to do it is to make action a function:
var action = function(a, b) { return a + b; };
...
var z = action(x, y);
Comments
Use:
window.eval(x + action + y);
1 Comment
James Douglas
While this is correct, it sould also be pointed out that Eval is Evil, and why it should be used with caution.