allows point-free style with the closure library
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README.md
fn.js

README.md

functional-closure

allows point-free style with the closure library

func.curry(function, opt_minLength, opt_args)

takes a function to return the curry function of

the minLength says how many defined variables at least are passed before a value instead of a function is returned

the opt_args are the starting arguments.

the return function can then be called with any amount of arguments (use undefined to skip that particular argument) and will continue to return a curried function until the minimum length is satisfied or you invoke it with no arguments.

e.g.

// notice that as soon as there is a second argument we get a value back

var max = func.curry(Math.max, 2);

biggerThan10 = max(10);

biggerThan10(20); // 20

max(4)(2); // 4

max(4,6,3) // 6

max(8)(10, 4) // 10

// no minLength so need to execute with no arguments

var anyNumberMax = func.curry(Math.max);

anyNumberMax(1)(2)(3)(4, 5)() //5

var curryFilter = func.curry(goog.array.filter, 2);

var filterOdd = curryFilter(undefined, function(num) {
  return num % 2 == 1;
});

filterOdd([3,4,5,6,7]); // [3,5,7]

func.flip(function)

notice how we needed to use the undefined to skip the array? well we can also use flip

var flipFilter = func.curry(func.flip(goog.array.filter), 2);

var filterEven = flipFilter(function(num) {
  return num % 2 == 0;
});

filterEven([3,4,5,6,7]); // [4,6]

func.compose(function*)

pass in several functions or string lambdas (they will be run as map) and they will be applied to the list backwards.

var addOne = function(x) {return x + 1};
var addOneToAll = func.map(addOne);
var isOdd = function(x) {return x % 2};
var filterOdd = func.filter(isOdd);
var addThenGetOdd = func.compose(filterOdd, addOneToAll);
addThenGetOdd([1,2,3,4,5,6]); // [3,5,7]

func.filter

a curried filter function where first parameter is the function or string lambda and second array (will return value).

func.in

a curried function where first parameter is array and second is element to search the array for

func.contains

a curried function where first parameter is the element we're trying to match and the second is the array of elements to check

func.not

returns !argument

func.each

a curried function where first element is a list and second is the function to run on the list

func.doTo

a curried function where first element is a function and second is a list to run the function on

func.map

a curried function where first element is the mapping function or string lambda and second is the list to map.

func.lambda

transforms a string to a function, put in x as the passed in arg