We are required to write a JavaScript function that takes in an array of decimal strings. The function should return an array of strings of integers obtained by flooring the original corresponding decimal values of the array.For example, If the input array is −const input = ["1.00","-2.5","5.33333","8.984563"];Then the output should be −const output = ["1","-2","5","8"];ExampleThe code for this will be −const input = ["1.00","-2.5","5.33333","8.984563"]; const roundIntegers = arr => {    const res = [];    arr.forEach((el, ind) => {       const strNum = String(el);       res[ind] = parseInt(strNum);    });    return res; }; console.log(roundIntegers(input));OutputThe output in the console −[ 1, -2, 5, 8 ]

Suppose, we have an array of objects like this −const arr = [    {"name": "toto", "uuid": 1111},    {"name": "tata", "uuid": 2222},    {"name": "titi", "uuid": 1111} ];We are required to write a JavaScript function that splits the objects into separate array of arrays that have the similar values for the uuid property.OutputTherefore, the output should look like this −const output = [    [       {"name": "toto", "uuid": 1111},       {"name": "titi", "uuid": 1111}    ],    [       {"name": "tata", "uuid": 2222}    ] ];The code for this will be −const ... Read More

Suppose we have an array of sorted numbers but some elements of the array are out of their sorted order.We are required to write a JavaScript function that takes in one such array and returns a subarray of all those elements that are out of order.ExampleThe code for this will be −const arr = ["2", "3", "7", "4", "5", "6", "1"]; const findOutOfOrder = arr => {    let notInOrder = [];    notInOrder = arr.filter((el, ind) => {       return ind && this.next !== +el || (this.next = +el + 1, false);    }, {       next: null    });    return notInOrder; }; console.log(findOutOfOrder(arr));OutputThe output in the console −[ '7', '1' ]

Snake case is basically a style of writing strings by replacing the spaces with '_' and converting the first letter of each word to lowercase.We are required to write a JavaScript function that takes in a string and converts it to snake case.ExampleThe code for this will be −const str = 'This is a simple sentence'; const toSnakeCase = (str = '') => {    const strArr = str.split(' ');    const snakeArr = strArr.reduce((acc, val) => {       return acc.concat(val.toLowerCase());    }, []);    return snakeArr.join('_'); }; console.log(toSnakeCase(str));OutputFollowing is the output on console −this_is_a_simple_sentence

We are required to write a JavaScript function that takes in a string and returns the index of first character that appears twice in the string.If there is no such character then we should return -1.ExampleThe code for this will be −const str = 'Hello world, how are you'; const firstRepeating = str => {    const map = new Map();    for(let i = 0; i < str.length; i++){       if(map.has(str[i])){          return map.get(str[i]);       };       map.set(str[i], i);    };    return -1; }; console.log(firstRepeating(str));OutputFollowing is the output on console −2

We are required to write a JavaScript function that takes in a string and reverses the words in the string that have an odd number of characters in them.Any substring in the string qualifies to be a word, if either it is encapsulated by two spaces on either ends or present at the end or beginning and followed or preceded by a space.ExampleThe code for this will be −const str = 'hello world, how are you'; const idOdd = str => str.length % 2 === 1; const reverseOddWords = (str = '') => {    const strArr = str.split(' '); ... Read More

Suppose, we have an array of numbers like this −const arr = [1, 5, 2, 1, 2, 3, 4, 5, 7, 8, 7, 1];We are required to write a JavaScript function that takes in one such array and counts the sum of all distinct elements of the array.For example:The output for the array mentioned above will be −30ExampleThe code for this will be −const arr = [1, 5, 2, 1, 2, 3, 4, 5, 7, 8, 7, 1]; const distinctSum = arr => {    let res = 0;    for(let i = 0; i < arr.length; i++){       if(i === arr.lastIndexOf(arr[i])){          res += arr[i];       };       continue;    };    return res; }; console.log(distinctSum(arr));OutputFollowing is the output on console −30

We are required to write a JavaScript function that takes in a number and checks whether it falls in Fibonacci series or not.We should return a boolean on this basis.ExampleThe code for this will be −const num = 89; const isFib = query => {    if(query === 0 || query === 1){       return true;    }    let prev = 1;    let count = 2;    let temp = 0;    while(count >= query){       if(prev + count === query){          return true;       };       temp = prev;       prev = count;       count += temp;    };    return false; }; console.log(isFib(num));OutputFollowing is the output on console −true

Suppose we have a sorted array of literals like this −const arr = [2, 2, 3, 3, 3, 5, 5, 6, 7, 8, 9];We are required to write a JavaScript function that takes in one such array and returns the first number that appears only once in the array.If there is no such number in the array, we should return false.For this array, the output should be 6.ExampleThe code for this will be −const arr = [2, 2, 3, 3, 3, 5, 5, 6, 7, 8, 9]; const firstNonDuplicate = arr => {    let appeared = false;   ... Read More

We are required to write a JavaScript function that takes in a Number, say n, and we are required to check whether there exist such three consecutive natural numbers (not decimal/floating point) whose sum equals to n.If there exist such numbers, our function should return them, otherwise it should return false.ExampleThe code for this will be −const sum = 54; const threeConsecutiveSum = sum => {    if(sum < 6 || sum % 3 !== 0){       return false;    }    // three numbers will be of the form:    // x + x + 1 + ... Read More