8000 feat: Solved 15 Leetcode problems · ralvarezdev/leetcode@bddfc25 · GitHub
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feat: Solved 15 Leetcode problems
* Solved 15 Leetcode problems from the 30 Days of JavaScript study plan
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‎30-days-of-javascript/basic-array-transformations/easy/apply-transform-for-each-element.js

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/**
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* @param {number[]} arr
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* @param {Function} fn
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* @return {number[]}
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*/
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var map = function (arr, fn)
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{
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const newArray = new Array(arr.length);
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arr.forEach((element, i) => newArray[i] = fn(element, i));
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return newArray;
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};

‎30-days-of-javascript/basic-array-transformations/easy/array-resuce-transformation.js

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/**
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* @param {number[]} nums
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* @param {Function} fn
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* @param {number} init
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* @return {number}
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*/
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var reduce = function (nums, fn, init)
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{
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let accum = init;
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nums.forEach((element, _) =>
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{
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accum = fn(accum, element);
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});
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return accum;
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};

‎30-days-of-javascript/basic-array-transformations/easy/filter-elements-from-array.js

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/**
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* @param {number[]} arr
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* @param {Function} fn
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* @return {number[]}
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*/
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var filter = function (arr, fn)
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{
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const newArr = [];
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arr.forEach((element, i) =>
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{
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if (fn(element, i))
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newArr.push(element);
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});
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return newArr;
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};

‎30-days-of-javascript/closures/easy/counter-ii.js

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/**
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* @param {integer} init
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* @return { increment: Function, decrement: Function, reset: Function }
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*/
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var createCounter = function (init)
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{
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const def = init;
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return {
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increment: () => ++init,
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decrement: () => --init,
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reset: () => init = def
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};
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};
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/**
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* const counter = createCounter(5)
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* counter.increment(); // 6
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* counter.reset(); // 5
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* counter.decrement(); // 4
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*/

‎30-days-of-javascript/closures/easy/counter.js

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/**
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* @param {number} n
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* @return {Function} counter
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*/
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var createCounter = function (n)
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{
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let counter = n;
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return function ()
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{
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return counter++;
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};
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};
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/**
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* const counter = createCounter(10)
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* counter() // 10
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* counter() // 11
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* counter() // 12
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*/

‎30-days-of-javascript/closures/easy/create-hello-world-function.js

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/**
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* @return {Function}
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*/
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function createHelloWorld ()
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{
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return function ()
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{
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return "Hello World";
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};
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};
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/**
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* const f = createHelloWorld();
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* f(); // "Hello World"
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*/

‎30-days-of-javascript/closures/easy/to-be-or-not-to-be.js

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/**
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* @param {string} val
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* @return {Object}
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*/
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var expect = function (val)
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{
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const expectObject = {};
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expectObject.toBe = function (valToBe)
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{
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if (valToBe !== val)
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throw new Error("Not Equal");
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return true;
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};
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expectObject.notToBe = function notToBe (valNotToBe)
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{
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if (valNotToBe === val)
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throw new Error("Equal");
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return true;
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};
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return expectObject;
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};
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/**
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* expect(5).toBe(5); // true
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* expect(5).notToBe(5); // throws "Equal"
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*/

‎30-days-of-javascript/function-transformations/easy/allow-one-function-call.js

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/**
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* @param {Function} fn
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* @return {Function}
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*/
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var once = function (fn)
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{
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let called = false;
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return function (...args)
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{
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if (called)
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return undefined;
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called = true;
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return fn(...args);
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};
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};
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/**
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* let fn = (a,b,c) => (a + b + c)
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* let onceFn = once(fn)
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*
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* onceFn(1,2,3); // 6
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* onceFn(2,3,6); // returns undefined without calling fn
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*/

‎30-days-of-javascript/function-transformations/easy/function-composition.js

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/**
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* @param {Function[]} functions
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* @return {Function}
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*/
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var compose = function (functions)
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{
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return function (x)
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{
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for (let i = functions.length - 1; i >= 0; i--)
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x = functions[i](x);
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return x;
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};
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};
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/**
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* const fn = compose([x => x + 1, x => 2 * x])
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* fn(4) // 9
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*/

‎30-days-of-javascript/function-transformations/easy/length-of-arguments-passed.js

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/**
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* @param {...(null|boolean|number|string|Array|Object)} args
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* @return {number}
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*/
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var argumentsLength = function (...args)
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{
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return args.length;
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};
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/**
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* argumentsLength(1, 2, 3); // 3
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*/

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