daronwolff
/ array_inverter.js
Last active
May 19, 2016 18:10
Javascript - Invert array position elements manually. I created this little code to my friends in Kwan
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| "use strict"; | |
| if (!Array.prototype.reverseOrder) { | |
| Array.prototype.invertir = function() { | |
| var inverted = []; | |
| for (var i = this.length - 1; i >= 0; i--) { | |
| inverted[this.length - (i + 1)] = this[i]; | |
| } | |
| return inverted; | |
| } | |
| } |
daronwolff
/ isArray.js
Created
May 19, 2016 23:05
This little script is used to test if an array is really an array or not.
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| "use strict"; | |
| if (Array.prototype.isArray === undefined) { | |
| Array.prototype.isArray = function (value) { | |
| return Object.prototype.toString.apply(value) === "[object Array]"; | |
| }; | |
| } | |
| /* | |
| Examples | |
| */ | |
| Array.isArray({}); //false |
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| function factorial(n) { | |
| "use strict"; | |
| var result = 1; | |
| while (n > 1) { | |
| result *= n; | |
| console.log(result); | |
| n -= 1; | |
| } | |
| } |
daronwolff
/ exercise_2.js
Last active
May 20, 2016 19:29
Write two binary functions "add" and "mul", that take two numbers and return their sum and product
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| "use strict"; | |
| var add = (function(a){ | |
| return function (b){ | |
| return a + b; | |
| } | |
| }); | |
| var mul = (function(a){ | |
| return function(b){ | |
| var total = a * b; | |
| return total; |
daronwolff
/ exercise_3.js
Created
May 20, 2016 19:34
Write a function that takes an argument and returns a function that returns that argumen
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| "use strict"; | |
| function identify(x) { | |
| return function(){ | |
| return x; | |
| } | |
| } | |
| var idf = identify(3); | |
| idf(); // 3 |
daronwolff
/ exercise_4.js
Created
May 20, 2016 20:31
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| var add = (function(a) { | |
| return function(b) { | |
| return a + b; | |
| } | |
| }); | |
| var mul = (function(a) { | |
| return function(b) { | |
| var total = a * b; |
daronwolff
/ exercise_5.js
Created
May 20, 2016 21:07
Write a function that takes a function and an argument, and returns a function that can supply a second argument add3 = curry(add,3); add3(4); // 7
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| var add = (function(a) { | |
| return function(b) { | |
| return a + b; | |
| } | |
| }); | |
| var mul = (function(a) { | |
| return function(b) { | |
| var total = a * b; |
daronwolff
/ exercise_6.js
Created
May 20, 2016 22:03
Write a methodize, a function that converts a binary function to a method
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| function add(a,b) { | |
| return (a + b); | |
| } | |
| function methodize(func) { | |
| return function(y){ | |
| return func(this,y); | |
| } | |
| } | |
| Number.prototype.add = methodize(add); | |
| (2).add(3) // 5 |
daronwolff
/ exercise_7.js
Last active
May 20, 2016 22:15
Write a DEmethodize, a function that converts a method to a binary function Example demethodize(Number.prototype.add)(5)(6) // 11
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| function demethodize(func){ | |
| return function(that,y){ | |
| return func.call(that,y); | |
| } | |
| } | |
| var add = (function(a) { | |
| return function(b) { | |
| return a + b; | |
| } | |
| }); |
daronwolff
/ exercise_8.js
Created
May 20, 2016 22:31
Write a TWICE, function that takes a binary function and returns a unitary function that passes its arguments to the binary function twice Example var double = twice(add); double(11); // 22 var square = twice(mul); square(11); // 121
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| var add = (function(a) { | |
| return function(b) { | |
| return a + b; | |
| } | |
| }); | |
| var mul = (function(a) { | |
| return function(b) { | |
| var total = a * b; | |
| return total; | |
| } |
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