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We are required to declare a function, let’s say insertAllPositions, which takes two arguments −an element, x, and an array, arr. Functions must return an array of arrays, with each array corresponding to arr with x inserted in a possible position.That is, if arr is the length N, then the result is an array with N + 1 arrays −For example, the result of insertAllPositions(10, [1, 2, 3]) should be −const output = [ [10, 1, 2, 3], [1, 10, 2, 3], [1, 2, 10, 3], [1, 2, 3, 10] ];We are required to write this ... Read More
Suppose, we have an array of objects that contains information about marks of some students in a test −const students = [ { name: 'Andy', total: 40 }, { name: 'Seric', total: 50 }, { name: 'Stephen', total: 85 }, { name: 'David', total: 30 }, { name: 'Phil', total: 40 }, { name: 'Eric', total: 82 }, { name: 'Cameron', total: 30 }, { name: 'Geoff', total: 30 } ];We are required to write a JavaScript function that takes in one such array and returns a object with the name and ... Read More
Suppose we have two arrays of literals like these −const options = ['A', 'B', 'C', 'D']; const values = [true, false, false, false];We are required to write a JavaScript function that creates and returns a new Array of Objects from these two arrays, like this −const response = [ {opt: 'A', val: true}, {opt: 'B', val: false}, {opt: 'C', val: false}, {opt: 'D', val: false}, ];ExampleFollowing is the code −const options = ['A', 'B', 'C', 'D']; const values = [true, false, false, false]; const mapArrays = (options, values) => { const res = []; ... Read More
We are required to write a JavaScript function that generates an array of exactly five unique random numbers. The condition is that all the numbers have to be in the range [0, 9] and the first number cannot be 0.ExampleFollowing is the code −const fiveRandoms = () => { const arr = [] while (arr.length < 5) { const random = Math.floor(Math.random() * 10); if (arr.indexOf(random) > -1){ continue; }; if(!arr.length && !random){ continue; } arr[arr.length] = random; } return arr; }; console.log(fiveRandoms());OutputThis will produce the following output in console −[ 9, 0, 8, 5, 4 ]
We are required to write a JavaScript function that takes in a string that represents a number. Replace the leading zero with spaces in the number. We need to make sure the prior spaces in number are retained.For example,If the string value is defined as −" 004590808"Then the output should come as −" 4590808"ExampleFollowing is the code −const str = ' 004590808'; const replaceWithSpace = str => { let replaced = ''; const regex = new RegExp(/^\s*0+/); replaced = str.replace(regex, el => { const { length } = el; return ' '.repeat(length); }); return replaced; }; console.log(replaceWithSpace(str));OutputThis will produce the following output in console −4590808
We are required to write a JavaScript function that takes in a number and calculates its square root without using the Math.sqrt() function.ExampleFollowing is the code −const square = (n, i, j) => { let mid = (i + j) / 2; let mul = mid * mid; if ((mul === n) || (Math.abs(mul - n) < 0.00001)){ return mid; }else if (mul < n){ return square(n, mid, j); }else{ return square(n, i, mid); } } // Function to find the square root of n ... Read More
We are required to write a JavaScript function that takes in a string. It should print out each number for every corresponding letter in the string.For example, a = 1 b = 2 c = 3 d = 4 e = 5 . . . Y = 25 Z = 26Therefore, if the input is "hello man", Then the output should be a number for each character −"8, 5, 12, 12, 15, 13, 1, 14"ExampleFollowing is the code −const str = 'hello man'; const charPosition = str => { str = str.split(''); const arr = []; const ... Read More
We are required to write a JavaScript function that takes in a number which may be an integer or a floating-point number. If it's a floating-point number, we have to return the count of numbers after the decimal point. Otherwise we should return 0.For our example, we are considering two numbers −const num1 = 1.123456789; const num2 = 123456789;ExampleFollowing is the code −const num1 = 1.123456789; const num2 = 123456789; const decimalCount = num => { // Convert to String const numStr = String(num); // String Contains Decimal if (numStr.includes('.')) { return numStr.split('.')[1].length; ... Read More
We are required to write a JavaScript function that takes in an array of numbers and returns a number which can exactly divide all the numbers in the array.Let’s say the following is our array −const arr = [4, 6, 34, 76, 78, 44, 34, 26, 88, 76, 42];ExampleFollowing is the code −const arr = [4, 6, 34, 76, 78, 44, 34, 26, 88, 76, 42]; const dividesAll = el => { const result = []; let num; for (num = Math.floor(el / 2); num > 1; num--){ if (el % num === 0) { result.push(num); } }; return result; }; const dividesArray = arr => { return arr.map(dividesAll).reduce((acc, val) => { return acc.filter(el => val.includes(el)); }); }; console.log(dividesArray(arr));OutputThis will produce the following output in console −[ 2 ]
We are required to write a JavaScript function that takes in an array of numbers. The function should sort the array with using the Array.prototype.sort() method. We are required to use the Array.prototype.reduce() method to sort the array.Let’s say the following is our array −const arr = [4, 56, 5, 3, 34, 37, 89, 57, 98];ExampleFollowing is the code −// we will sort this array but // without using the array sort function // without using any kind of conventional loops // using the ES6 function reduce() const arr = [4, 56, 5, 3, 34, 37, 89, 57, 98]; const ... Read More