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In Mathematics, a strictly increasing function is that function in which the value to be plotted always increase. Similarly, a strictly decreasing function is that function in which the value to be plotted always decrease.We are required to write a JavaScript function that takes in an array of numbers and returns true if it’s either strictly increasing or strictly decreasing, otherwise returns false.ExampleFollowing is the code −const arr = [12, 45, 6, 4, 23, 23, 21, 1]; const arr2 = [12, 45, 67, 89, 123, 144, 2656, 5657]; const sameSlope = (a, b, c) => (b - a < 0 && c - b < 0) || (b - a > 0 && c - b > 0); const increasingOrDecreasing = (arr = []) => { if(arr.length
We are required to write a JavaScript function that takes in three numbers say a, b and c representing the length of three sides of a triangle. The function should return true if those three sides represent a right-angle triangle, false otherwise.Right angle triangleA triangle is a right-angle triangle if one of the three angles in the triangle is 90 degree. And one angle in the triangle is 90 degrees when the square of the longest side is equal to the sum of squares of the other two sides.For example − 3, 4, 5, as3*3 + 4*4 = 5*5 = ... Read More
We are required to write a JavaScript function that takes in a number as the first argument, say n, and an array of numbers as the second argument. The function should return the smallest n digit number which is a multiple of all the elements specified in the array. If there exist no such n digit element then we should return the smallest such element.For example: If the array is −const arr = [12, 4, 5, 10, 9]For both n = 2 and n = 3, the output should be 180ExampleFollowing is the code −const arr = [12, 4, 5, ... Read More
We have an array of arrays like this −const arr = [[12, 56], [3, 45], [23, 2], [2, 6], [2, 8]];Note that while the array can have any number of elements, each subarray should strictly contain two numbers.The two numbers in each subarray represents a fraction. For example, the fraction represented by the first subarray is 12/56, by the second is 3/45 and so on.We are required to write a JavaScript function that takes in one such array and calculates the sum of fractions represented by all the subarrays. Calculate the sum in fraction form (i.e., without converting them to ... Read More
We are required to write a JavaScript function that takes in two numbers a and b returns their digit distance.Digit distanceThe digit distance of two numbers is the absolute sum of the difference between their corresponding digits.For example: If the numbers are −345 678Then the digit distance will be −|3-6| + |4-7| + |5-8| = 3 + 3 + 3 = 9ExampleFollowing is the code −const num1 = 345; const num2 = 678; const digitDistance = (a, b) => { const aStr = String(a); const bStr = String(b); let diff = 0; for(let i = 0; ... Read More
We are required to write a JavaScript function that takes in two numbers, say a and b and returns the sum of all the prime numbers that fall between a and b. We should include a and b if they are prime as well.ExampleFollowing is the code −const num1 = 45; const num2 = 345; const isPrime = n => { if (n===1){ return false; }else if(n === 2){ return true; }else{ for(let x = 2; x < n; x++){ if(n % x === 0){ return false; } } return true; }; }; const primeBetween = (a, b) => { const res = []; while(a
Suppose, we have the following array of strings that might contain duplicate characters −const arr = ['54gdgdfe3', '434ffd', '43frdf', '43fdhnh', 'wgcxhjny', 'fsdf34'];We are required to write a JavaScript function that takes in one such array and returns the very first element from the array that contains 0 duplicate characters.If there does not exist any such string, we should return false.ExampleFollowing is the code −const arr = ['54gdgdfe3', '434ffd', '43frdf', '43fdhnh', 'wgcxhjny', 'fsdf34']; const isUnique = str => { return str.split('').every(el => str.indexOf(el) === str.lastIndexOf(el)); }; const findUniqueString = arr => { for(let i = 0; i < ... Read More
We are required to write a JavaScript function that takes in an array of numbers and sorts the array such that first all the even numbers appear in ascending order and then all the odd numbers appear in ascending order.For example: If the input array is −const arr = [2, 5, 2, 6, 7, 1, 8, 9];Then the output should be −const output = [2, 2, 6, 8, 1, 5, 7, 9];ExampleFollowing is the code −const arr = [2, 5, 2, 6, 7, 1, 8, 9]; const isEven = num => num % 2 === 0; const sorter = ((a, ... Read More
We have a string of length m that contains first m letters of the English alphabets, but somehow, one element went missing from the string. So, now the string contains, m-1 lettersWe are required to write a function that takes in one such string and returns the missing element from the stringExampleFollowing is the code −const str = "acdghfbekj"; const missingCharacter = str => { // to make the function more consistent const s = str.toLowerCase(); for(let i = 97; ; i++){ if(s.includes(String.fromCharCode(i))){ continue; }; ... Read More
We are required to write a JavaScript function that takes in a string and a number, say n, and the function should return a new string in which all the letters of the original string are repeated n times.For example: If the string is −const str = 'how are you'And the number n is 2Then the output should be −const output = 'hhooww aarree yyoouu'ExampleFollowing is the code −const str = 'how are you'; const repeatNTimes = (str, n) => { let res = ''; for(let i = 0; i < str.length; i++){ // using ... Read More