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Variadic compose by multiple calls
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var compose = function compose(f) { | |
var queue = f ? [f] : []; | |
var fn = function fn(g) { | |
if (arguments.length) { | |
queue.push(g); | |
return fn; | |
} | |
return function() { | |
var args = Array.prototype.slice.call(arguments); | |
queue.forEach(function(func) { | |
args = [func.apply(this, args)]; | |
}); | |
return args[0]; | |
} | |
}; | |
return fn; | |
}; |
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//------------------------------------------------------------------------------ | |
var add1 = function(x) {return x + 1;}; | |
var mult2 = function(x) {return x * 2;}; | |
var square = function(x) {return x * x;}; | |
var negate = function(x) {return -x;}; | |
//------------------------------------------------------------------------------ | |
var f = compose(add1)(mult2)(square)(negate)(); | |
console.assert(-36, f(2), "f(2)"); |
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this is currying, not composing.
composing would have [psuedo] syntax like: