LeetCode/30daysOfJavaScript.html at main · libbyreeves/LeetCode · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>LeetCode - 30 Days of JavaScript</title>
</head>
<body>
    <h1>30 Days of JavaScript</h1>
    <script>
        //2667. Create Hello World Function

        // const createHelloWorld = function() {
        //    return function(...args) {
        //     return "Hello World";
        //    }
        // };

        //2620. Counter

        // function createCounter(n) {
        //     let counterValue = n;

        //     function counter() {

        //         return counterValue++;
        //     }
        //     return counter;
        // }

        //2704. To Be Or Not To Be

            // const expect = function (initialValue) {
            //     return {
            //         toBe: function (val) {
            //             if (initialValue === val) {
            //                 return true;
            //             } else {
            //                 throw new Error("Not Equal");
            //             }
            //         },

            //         notToBe: function (val) {
            //             if (initialValue !== val) {
            //                 return true;
            //             } else {
            //                 throw new Error("Equal");
            //             }
            //         }
            //     };

            //     };


       //Counter II

    //    const createCounter = function (init) {
    //         let count = init;
    //         let numArray = [];
    //         return {
    //             increment: function () {
    //                 count++;
    //                 numArray.push(count);
    //                 return (count);
    //             },

    //             decrement: function () {
    //                 count--;
    //                 numArray.push(count);
    //                 return (count);
    //             },

    //             reset: function () {
    //                 count = init;
    //                 numArray.push(count);
    //                 return (count);
    //             }


    //         }
    //     }

    //Apply Transofmr Over Each Element in Array
        //given input is an array, and a function
        //return a new array with a transformation to each element
            //returnedArray[i] = fn(arr[i], i)
        //do not use Array.map
        // const map = function (arr, fn) {
        //     for (let i = 0; i < arr.length; i++) {
                //apply the function to each value in the array
                //push values into a new array
            //     console.log(arr[i]);
            //     arr[i] = fn(arr[i], i);
            // }
            // return arr;
            // };

            // map([1,2,3]);

        //Filter Elements from Array
            //given an integer array []
            //given a filtering function fn(arr[i], i)
            //return a filtered array []

        // const filter = function(arr, fn) {
        //     let filteredArr = [];
        //     for (let i = 0; i < arr.length; i++) {
        //         if (fn(arr[i], i) === true || fn(arr[i], i) != 0) {

        //             filteredArr.push(arr[i])
        //         }
        //     }
        //     return filteredArr;
        // };

        //Array Reduce Transformation
        //given: nums [integer array], fn (reducer function), init (initial value)

        const reduce = function(nums, fn, init) {
            if (nums.length === 0) {
                return init;
            }

            for (let i = 0; i < nums.length; i++) {
                let val = fn(init, nums[i]);
                init = val;
                console.log(init);
            }
            return init
        };
        function sum(accum, curr) { return accum + curr; }
        reduce([1, 2, 3, 4], sum, 0)


    </script>

</body>
</html>