How do I build dynamic functions with javascript?

Question

I'm getting myself confused with all these languages! :)

// given this function
var f = function(a,b) { return a == b; }

// and these values for a
var a = [1,2,3]

// how do I make this array (a is replaced by its value)?
var results = [
   function(b) { return 1 == b; },
   function(b) { return 2 == b; },
   function(b) { return 3 == b; }
]

@qwertymk I don't want to mess with its context if that's what you're getting at. — Dane O'Connor
– Dane O'Connor, Commented Jan 27, 2012 at 17:52

Dave Newton · Accepted Answer · 2012-01-27 17:58:58Z

2

function build(a) {
    return function(b) { return a == b; }
}

var results = [];
var a = [1, 2, 3];

for (var i = 0; i < a.length; i++) {
    results.push(build(a[i]));
}

Some output:

> results[0](1)
true
> results[0](2)
false
> results[1](1)
false
> results[1](2)
true

edited Jan 27, 2012 at 17:58

answered Jan 27, 2012 at 17:51

Dave Newton

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