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We are required to write a function that takes in an array of two numbers a and b (a >= b) and returns the least common multiple of all the numbers between [a, b].ApproachWe will first write a basic function that calculates the least common multiple of two numbers, once we have that we will recursively call it over the numbers that fall between [a, b] and finally return the result.Exampleconst lcm = (a, b) => { let min = Math.min(a, b); while(min >= 2){ if(a % min === 0 && b % min === ... Read More
We are required to write a function that accepts two numbers and returns their least common multiple.Least Common Multiple (LCM)The least common multiple of two numbers a and b is the smallest positive integer that is divisible by both a and b.For example − The LCM of 6 and 8 is 24 because 24 is the smallest positive integer that is divided by both 6 and 8.Method to calculate LCMOne of the many ways of calculating LCM of two numbers a and b is by dividing the product of a and b by the greatest integer (also known as greatest ... Read More
Let’s say, we have an array of objects like this −const arr = [{ country: "cananda", count: 2 }, { country: "jamaica", count: 2 }, { country: "russia", count: 1 }, { country: "india", count: 3 }, { country: "spain", count: 2 }, { country: "portugal", count: 1 }, { country: "italy", count: 1 }];We are required to write a function that ... Read More
We are required to write a recursive function, say pickString that takes in a string that contains a combination of alphabets and numbers and returns a new string consisting of only alphabets.For example, If the string is ‘dis122344as65t34er’, The output will be: ‘disaster’Therefore, let’s write the code for this recursive function −Exampleconst str = 'ex3454am65p43le'; const pickString = (str, len = 0, res = '') => { if(len < str.length){ const char = parseInt(str[len], 10) ? '' : str[len]; return pickString(str, len+1, res+char); }; return res; }; console.log(pickString(str)); console.log(pickString('23123ca43n y43ou54 6do884 ... Read More
We have to write a function, say findPositions() that takes in two arrays as argument. And it should return an array of the indices of all the elements of the second array present in the first array.For example −If the first array is [‘john’, ‘doe’, ‘chris’, ‘snow’, ‘john’, ‘chris’], And the second array is [‘john’, chris]Then the output should be −[0, 2, 4, 5]Therefore, let’s write the code for this function. We will use a forEach() loop here;Exampleconst values = ['michael', 'jordan', 'jackson', 'michael', 'usain', 'jackson', 'bolt', 'jackson']; const queries = ['michael', 'jackson', 'bolt']; const findPositions = (first, second) => ... Read More
We are required to write a function for arrays Array.prototype.remove(). It accepts one argument; it is either a callback function or a possible element of the array. If it’s a function then the return value of that function should be considered as the possible element of the array and we have to find and delete that element from the array in place and the function should return true if the element was found and deleted otherwise it should return false.Therefore, let’s write the code for this function −Exampleconst arr = [12, 45, 78, 54, 1, 89, 67]; const names = ... Read More
We have an array of Numbers that contains some positive and negative even and odd numbers. We are required to sort the array in ascending order but all the even numbers should appear before any of the odd number and all the odd numbers should appear after all the even numbers and obviously both sorted within.Therefore, for example −If the input array is −const arr = [-2, 3, 6, -12, 9, 2, -4, -11, -8];Then the output should be −[ -12, -8, -4, -2, 2, 6, -11, 3, 9]Therefore, let’s write the code for this sort function −Exampleconst arr = ... Read More
We have to write a function that takes in an object and a string literals array, and it returns the filtered object with the keys that appeared in the array of strings.For example − If the object is {“a”: [], “b”: [], “c”:[], “d”: []} and the array is [“a”, “d”] then the output should be −{“a”: [], “d”:[]}Therefore, let’s write the code for this function, We will iterate over the keys of the object whether it exists in the array, if it does, if shove that key value pair into a new object, otherwise we keep iterating and return ... Read More
We have to write a function that accepts a string and mirrors its alphabet. For example −If the input is ‘abcd’ The output should be ‘zyxw’The function simply takes every character and map to the that is (26 - N) alphabets away from it, where is the 1 based index of that alphabet like 5 for e and 10 for j.We will use the String.prototype.replace() method here, to match all the English alphabets irrespective of their case. The full code for this function will be −Exampleconst str = 'ABCD'; const mirrorString = str => { const regex = /[A-Za-z]/g; ... Read More
Let’s say, we have an array that contains the score of some players in different sports. The scores are represented like this −const scores = [ {sport: 'cricket', aman: 54, vishal: 65, jay: 43, hardik: 88, karan:23}, {sport: 'soccer', aman: 14, vishal: 75, jay: 41, hardik: 13, karan:73}, {sport: 'hockey', aman: 43, vishal: 35, jay: 53, hardik: 43, karan:29}, {sport: 'volleyball', aman: 76, vishal: 22, jay: 36, hardik: 24, karan:47}, {sport: 'baseball', aman: 87, vishal: 57, jay: 48, hardik: 69, karan:37}, ];We have to write a function that takes in this array and returns a ... Read More