Object Oriented Programming Articles - Page 117 of 579

We are required to write a JavaScript function that takes in two strings and concatenates the second string to the first string.If the last character of the first string and the first character of the second string are the same then we have to omit one of those characters.ExampleThe code for this will be −const str1 = 'Food'; const str2 = 'dog'; const concatenateStrings = (str1, str2) => {    const { length: l1 } = str1;    const { length: l2 } = str2;    if(str1[l1 - 1] !== str2[0]){       return str1 + str2;    }; ... Read More

We are required to write a JavaScript function that takes in a number and returns a boolean based on the fact whether or not the number is a perfect square.Examples of perfect square numbers −Some perfect square numbers are −144, 196, 121, 81, 484ExampleThe code for this will be −const num = 484; const isPerfectSquare = num => {    let ind = 1;    while(ind * ind

We are required to write a JavaScript function that takes in an array of numbers and returns the cumulative sum of every number present at the index that is a multiple of n from the array.ExampleThe code for this will be −const arr = [5, 3, 5, 6, 12, 5, 65, 3, 2]; const num = 3; const nthSum = (arr, num) => {    let sum = 0;    for(let i = 0; i < arr.length; i++){       if(i % num !== 0){          continue;       };       sum += arr[i];    };    return sum; }; console.log(nthSum(arr, num));OutputThe output in the console −76

We are required to write a JavaScript function that takes in an array of Number. Then the function should return the average of its elements excluding the smallest and largest Number.ExampleThe code for this will be −const arr = [5, 3, 5, 6, 12, 5, 65, 3, 2]; const findExcludedAverage = arr => {    const creds = arr.reduce((acc, val) => {       let { min, max, sum } = acc;       sum += val;       if(val > max){          max = val;       };       if(val < min){          min = val;       };       return { min, max, sum };    }, {       min: Infinity,       max: -Infinity,       sum: 0    });    const { max, min, sum } = creds;    return (sum - min - max) / (arr.length / 2); }; console.log(findExcludedAverage(arr));OutputThe output in the console −8.666666666666666

We are required to write a JavaScript function that takes in an array of nested arrays of Numbers and some falsy values (including 0) and some strings as well and the function should return the product of number values present in the nested array. If the array contains some 0s, we should ignore them as well.ExampleThe code for this will be −const arr = [    1, 2, null, [       2, 5, null, undefined, false, 5, [          1, 3, false, 0, 2       ], 4, false    ], 4, 6, 0 ... Read More

We are required to write a JavaScript function that takes in Number arrays and returns the element from arrays that are not common to both.For example, if the two arrays are −const arr1 = [2, 4, 2, 4, 6, 4, 3]; const arr2 = [4, 2, 5, 12, 4, 1, 3, 34];OutputThen the output should be −const output = [ 6, 5, 12, 1, 34 ]ExampleThe code for this will be −const arr1 = [2, 4, 2, 4, 6, 4, 3]; const arr2 = [4, 2, 5, 12, 4, 1, 3, 34]; const deviations = (first, second) => {   ... Read More

We are required to write a JavaScript function that takes in an array of positive as well as negative Numbers and changes the positive numbers to corresponding negative numbers and the negative numbers to corresponding positive numbers in place.ExampleThe code for this will be −const arr = [12, 5, 3, -1, 54, -43, -2, 34, -1, 4, -4]; const changeSign = arr => {    arr.forEach((el, ind) => {       arr[ind] *= -1;    }); }; changeSign(arr); console.log(arr);OutputThe output in the console −[    -12, -5, -3, 1, -54,    43, 2, -34, 1, -4,    4 ]

We are required to write a JavaScript function that takes in a string and swaps the adjacent words of that string with one another until the end of that string.ExampleThe code for this will be −const str = "This is a sample string only"; const replaceWords = str => {    return str.split(" ").reduce((acc, val, ind, arr) => {       if(ind % 2 === 1){          return acc;       }       acc += ((arr[ind+1] || "") + " " + val + " ");       return acc;    }, ""); }; console.log(replaceWords(str));OutputThe output in the console −is This sample a only string

We are required to write a JavaScript function that takes in two numbers, say m and n and returns two numbers whose sum is n and product is m. If there exist no such numbers than our function should return false.ExampleThe code for this will be −const goldenNumbers = (sum, prod) => {    for(let i = 0; i < (sum / 2); i++){       if(i * (sum-i) !== prod){          continue;       };       return [i, (sum-i)];    };    return false; }; console.log(goldenNumbers(24, 144)); console.log(goldenNumbers(14, 45)); console.log(goldenNumbers(21, 98));OutputThe output in the console −false [ 5, 9 ] [ 7, 14 ]

We have an array that contains some string values as well as some false values.We are required to write a JavaScript function that takes in this array and returns a string constructed by joining values of the array and omitting false values.ExampleThe code for this will be −const arr = ["Here", "is", null, "an", undefined, "example", 0, "", "of", "a", null, "sentence"]; const joinArray = arr => {    const sentence = arr.reduce((acc, val) => {       return acc + (val || "");    }, "");    return sentence; }; console.log(joinArray(arr));OutputThe output in the console −Hereisanexampleofasentence