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- /*
- function myMethods(array) {
- let arr = array;
- function myIncludes(arr, value) {
- for (const iterator of arr) {
- if (iterator === value) {
- return true;
- }
- }
- return false;
- //Examples: --------------------------------------------------------------
- //The includes() returns true if the given value is part of the array
- //let myArray = ["Peter", "George", "Mary"];
- //myArray.includes("George"); // true
- //myArray.includes("John"); // false
- }
- function myIndexOf(arr, value) {
- for (let index = 0; index < arr.length; index++) {
- if (arr[index] === value) {
- return index;
- }
- }
- return -1;
- //Examples: --------------------------------------------------------------
- //The indexOf() returns the index where the given value is stored
- //# Returns -1 if value is not found
- //let myArray = ["Peter", "George", "Mary"];
- //myArray.indexOf("Mary"); // 2
- //myArray.indexOf("Nick"); // -1
- }
- function mySlice(arr, start, end) {
- let copy = [];
- if (start == undefined) {
- start = 0;
- }
- if (end == undefined) {
- end = arr.length;
- }
- for (let i = start; i < end; i++) {
- copy.push(arr[i]);
- }
- return copy;
- //Examples: --------------------------------------------------------------
- //The slice() function creates new array from part of another
- //# Note that the original array will not be modified
- //let myArray = ["one", "two", "three", "four", "five"];
- //let sliced = myArray.slice(2);
- //console.log(myArray);
- ////["one","two","three","four","five"]
- //console.log(sliced); // ["three","four","five"]
- //console.log(myArray.slice(2, 4)); // ["three","four"]
- }
- function mySplice(arr, start, count, elements) {
- let left = arr.slice(0, start);
- let remove = arr.slice(start, start + count);
- let right = arr.slice(start + count);
- arr.length = 0;
- for (const iterator of left) {
- arr.push(iterator);
- }
- if (right != undefined) {
- for (const iterator of elements) {
- arr.push(iterator);
- }
- }
- for (const iterator of right) {
- arr.push(iterator);
- }
- return remove;
- //Examples: --------------------------------------------------------------
- //The splice() function adds/removes items to/from an array, and returns the removed item(s)
- //# This function changes the original array
- //let nums = [5, 10, 15, 20, 25, 30];
- //let mid = nums.splice(2, 3); // start, delete-count
- //console.log(mid.join('|')); // 15|20|25
- //console.log(nums.join('|')); // 5|10|30
- //nums.splice(3, 2, "twenty", "twenty-five");
- //console.log(nums.join('|')); // 5|10|15|twenty|twenty-five|30
- }
- function myMap(arr, operator) {
- let result = [];
- for (const iterator of arr) {
- result.push(operator(iterator));
- }
- return result;
- //Examples: --------------------------------------------------------------
- //The map() function creates new array by applying a function to every element
- //let myArr = ['one', 'two', 'three', 'four'];
- //let lengths = myArr.map(x => x.length);
- //console.log(lengths); // [3,3,5,4]
- //let numsAsStrings = ["5", "3", "14", "-2", "8"]
- //let nums = numsAsStrings.map(Number);
- //console.log(nums); // [5, 3, 14, -2, 8]
- //let incr = nums.map(x => x + 1);
- //console.log(incr); // [6, 4, 15, -1, 9]
- }
- function myFilter(arr, predicate) {
- let result = [];
- for (const iterator of arr) {
- if (predicate(iterator)) {
- result.push(iterator);
- }
- }
- return result;
- //Examples: --------------------------------------------------------------
- //The filter() function creates new array from elements matching predicate
- //# Predicate is a function returning a Boolean value (true or false)
- //let myArr = ['one', 'two', 'three', 'four'];
- //let longWords = myArr.filter(x => x.length > 3);
- //console.log(longWords); // ['three','four']
- //let nums = [5, -11, 3, -2, 8]
- //let positiveNums = nums.filter(x => x > 0);
- //console.log(positiveNums); // [5, 3, 8]
- }
- function sorting(arr) {
- arr.sort((a, b) => a - b);
- let newArr = arr.slice(0, 4);
- // console.log(newArr.join(' '));
- // console.log(arr[0], arr[1]);
- return newArr.join(' ');
- //Examples: --------------------------------------------------------------
- //The sort() function sorts the items of an array
- //# Sorting can be alphabetic or numeric, and either ascending (up) or descending (down)
- //let names = ["Peter", "George", "Mary"];
- //names.sort(); // Default behaviour – alphabetical order
- //console.log(names); // ["George","Mary","Peter"]
- //let numbers = [20, 40, 10, 30, 100, 5];
- //numbers.sort(); // Unexpected result on arrays of numbers!
- //console.log(numbers); // [10,100,20,30,40,5]
- //# If result < 0, a is sorted before b , If result < 0, a is sorted before b , If result = 0, a and b are equal (no change)
- //let nums = [20, 40, 10, 30, 100, 5];
- //nums.sort((a, b) => a - b); // Compare elements as numbers <-- Use that
- //console.log(nums.join('|')); // 5|10|20|30|40|100
- //let words = ['nest', 'Eggs', 'bite', 'Grip', 'jAw'];
- //words.sort((a, b) => a.localeCompare(b)); <-- Use that
- //// ['bite', 'Eggs', 'Grip', 'jAw', 'nest']
- //let wordsLength = ['Isacc', 'Theodor', 'Jack', 'Harrison', 'George'];
- //wordsLength.sort((a, b) => a.length - b.length); <-- Use that
- //// ['Jack', 'Isacc', 'George', 'Theodor', 'Harrison']
- }
- // console.log(myIncludes(arr, 8));
- // console.log(myIncludes(arr, 10));
- // console.log(myIndexOf(arr, -3));
- // let predic = myFilter(arr, x => x > 7);
- // let nums = myMap(arr, x => x + 1);
- // let result = mySplice(arr, 3, 2, []);
- // let newArr = mySlice(arr, 1, 3);
- // let sorted = sorting(arr);
- // console.log(sorted);
- // console.log(predic);
- // console.log(nums);
- // console.log(result);
- // console.log(newArr);
- }
- myMethods([5, 8, -3, 11, 44, 13, -8]);
- */
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