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December 10, 2015 12:30
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<html><body><pre><script> | |
"use strict"; | |
function log(arg) { | |
document.writeln(arg); | |
} | |
function identity(x) { | |
return x; | |
} | |
log(identity(3)); | |
function add(x, y) { | |
return x + y; | |
} | |
function mul(x,y) { | |
return x * y; | |
} | |
function sub(x,y) { | |
return x - y; | |
} | |
log("add: " + add(2,2)); | |
log("mul: " + mul(2,4)); | |
log("sub: " + sub(2,2)); | |
// Write a function that takes an argument and returns a | |
// function that returns that argument. | |
function identityf(argument) { | |
return function () { | |
return argument; | |
} | |
} | |
var three = identityf(3); | |
log("identityf: " + three()); | |
// Write a function that adds from two invocations. | |
function addf(first) { | |
return function(second) { | |
return first + second; | |
} | |
} | |
log("addf: " + addf(3)(4)); | |
// Write a function liftf that takes a binary function, and | |
// makes it callable with two invocations | |
function liftf(binary) { | |
return function(first) { | |
return function(second) { | |
return binary(first,second); | |
} | |
} | |
} | |
var addf = liftf(add); | |
log("liftf: " + addf(3)(4)); | |
// function curry | |
function curry(binary, first) { | |
return function(second) { | |
return binary(first, second); | |
} | |
} | |
var add3 = curry(add, 3); | |
log("curry: " + add3(4)); | |
log("curry(mul, 5)(6): " + curry(mul, 5)(6)); | |
</script></pre></body></html> |
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