Is it possible to run a function whose name is saved in a string?
For example: I have three functions:
function nr1(p0, p1){
/* [...] */
}
function nr2(p0, p1){
/* [...] */
}
function nr3(p0, p1){
/* [...] */
}
and I have a string whose content is a function name, for example:
var a_string = "nr2(27, 42)";
Is it possible to execute the function whose name is stored in the string?
you can eval() it. Observe the following example...
function something() {
console.log('did');
}
var str = 'something()'
eval(str) // did
As comments suggest, not the best idea to take and run with - though it works... To expand on that just a bit more, I found this blog post which shares some good pointers on the somewhat controversial usage of this technique: eval() isn’t evil, just misunderstood
JSFiddle - simple demo
eval
you can use eval to evaluates JavaScript code represented as a string.
eval(a_string) but
you better change your implementation instead of saving a string function call
function nr1(p0, p1){
console.log('nr1 p0: ', p0);
console.log('nr1 p1: ', p1);
}
function nr2(p0, p1){
console.log('nr2 p0: ', p0);
console.log('nr2 p1: ', p1);
}
function nr3(p0, p1){
console.log('nr3 p0: ', p0);
console.log('nr3 p1: ', p1);
}
var a_string = "nr2(27, 42)";
eval(a_string);You can do eval, although it is frowned upon because of it's vulnerabilities. Something you could do is find it in the window object and then execute:
window["functionName"](args);
Calling with eval:
function test() {
console.log('test');
}
var fnstring = "test()";
eval(fnstring);
window) then you can do e.g.window['foo']()eval? tryeval(a_string);note eval is bad.. you should change your implementation