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@darul75 darul75/ramda.js
Created Sep 8, 2015

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ramda functional js exercice
// Exercise 1
//==============
// Refactor to remove all arguments by partially applying the function
var words = function(str) {
return _.split(' ', str);
};
var match = R.curry(function(what, x) {
return x.match(what);
});
var split = R.curry(function(what, x) {
return x.split(what);
});
words = split(' ');
// Exercise 1a
//==============
// Use map to make a new words fn that works on an array of strings.
var sentences = R.map(words);
// Exercise 2
//==============
// Refactor to remove all arguments by partially applying the functions
var filterQs = function(xs) {
return _.filter(function(x){ return match(/q/i, x); }, xs);
};
var filter = R.curry(function(f, xs) {
return xs.filter(f);
});
filterQs = filter(match(/q/i));
// Exercise 3
//==============
// Use the helper function _keepHighest to refactor max to not reference any
// arguments
// LEAVE BE:
var _keepHighest = function(x,y){ return x >= y ? x : y; };
// REFACTOR THIS ONE:
var max = function(xs) {
return _.reduce(function(acc, x){
return _keepHighest(acc, x);
}, -Infinity, xs);
};
var reduce = R.curry(function(f, a, xs) {
return xs.reduce(f, a);
});
var max = reduce(_keepHighest, 0);
// Bonus 1:
// ============
// wrap array's slice to be functional and curried.
// //[1,2,3].slice(0, 2)
var slice = R.curry(function(s,e, xs) {
return xs.slice(s,e);
});
var xs = [1,2,3,4,5];
var s = slice(1, 3);
s(xs);
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