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Front End Technology Articles
Page 366 of 652
Find the average of all elements of array except the largest and smallest - JavaScript
We are required to write a JavaScript function that takes in an array of numbers and returns the average of its elements excluding the smallest and largest numbers. Approach The solution involves finding the minimum and maximum values, calculating the total sum, then computing the average of remaining elements after excluding min and max values. Example const arr = [1, 4, 5, 3, 5, 6, 12, 5, 65, 3, 2, 65, 9]; const findExcludedAverage = arr => { const creds = arr.reduce((acc, val) => { ...
Read MoreReduce an array to the sum of every nth element - JavaScript
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. Let's write the code for this function − Example const arr = [1, 4, 5, 3, 5, 6, 12, 5, 65, 3, 2, 65, 9]; const num = 2; const nthSum = (arr, num) => { let sum = 0; for(let i = 0; i < arr.length; i++){ ...
Read MoreProgram to append two given strings such that, if the concatenation creates a double character then omit one of the characters - JavaScript
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. Let's say the following are our strings in JavaScript − Problem Example const str1 = 'Food'; const str2 = 'dog'; // Expected output: 'Foodog' (last 'd' of 'Food' matches first 'd' of 'dog') Solution Let's write the code for this function − ...
Read MorePrime numbers in a range - JavaScript
We are required to write a JavaScript function that takes in two numbers, say, a and b and returns the total number of prime numbers between a and b (including a and b, if they are prime). For example − If a = 2, and b = 21, the prime numbers between them are 2, 3, 5, 7, 11, 13, 17, 19 And their count is 8. Our function should return 8. Understanding Prime Numbers A prime number is a natural number greater than 1 that has no positive divisors other than 1 ...
Read MoreComparing forEach() and reduce() for summing an array of numbers in JavaScript.
When summing arrays in JavaScript, both forEach() and reduce() are common approaches. This article compares their performance to help you choose the right method. Since we can't demonstrate with truly massive arrays here, we'll simulate the performance impact by running the summing operation many times in a loop. The Two Approaches Here's how each method works for summing an array: const arr = [1, 4, 4, 54, 56, 54, 2, 23, 6, 54, 65, 65]; // Using reduce() - functional approach const reduceSum = arr => arr.reduce((acc, val) => acc + val); // ...
Read MoreSumming numbers from a string - JavaScript
We are required to write a JavaScript function that takes in a string that contains some one-digit numbers in between and the function should return the sum of all the numbers present in the string. Let's say the following is our string with numbers: const str = 'gdf5jhhj3hbj4hbj3jbb4bbjj3jb5bjjb5bj3'; Method 1: Using for Loop with Type Conversion This approach splits the string into characters and checks each one using type conversion: const str = 'gdf5jhhj3hbj4hbj3jbb4bbjj3jb5bjjb5bj3'; const sumStringNum = str => { const strArr = str.split(""); let ...
Read MoreFinding difference of greatest and the smallest digit in a number - JavaScript
We are required to write a JavaScript function that takes in a number and returns the difference between the greatest and the smallest digit present in it. For example: If the number is 5464676, then the smallest digit here is 4 and the greatest is 7 Hence, our output should be 3 Example Let's write the code for this function — const num = 44353456; const difference = (num, min = Infinity, max = -Infinity) => { if(num){ const digit = num ...
Read MoreObject to array - JavaScript
Converting an object to an array of key-value pairs is a common task in JavaScript. There are several built-in methods to achieve this transformation. Sample Object Let's start with this example object: const obj = { name: "Vikas", age: 45, occupation: "Frontend Developer", address: "Tilak Nagar, New Delhi", experience: 23, salary: "98000" }; Using Object.entries() (Recommended) The simplest approach is using Object.entries(), which directly converts an object to an ...
Read MoreSplit number into n length array - JavaScript
We are required to write a JavaScript function that takes in two numbers say m and n, and returns an array of size n with all the elements of the resulting array adding up to m. Let's write the code for this function − Example Following is the code − const len = 8; const sum = 5; const splitNumber = (len, sum) => { const res = []; for(let i = 0; i < len; i++){ res.push(sum / ...
Read MoreProgram to find largest of three numbers - JavaScript
We are required to write a JavaScript function that takes in three or more numbers and returns the largest of those numbers. For example: If the input numbers are − 4, 6, 7, 2, 3 Then the output should be − 7 Method 1: Using Math.max() with Spread Operator The simplest approach is using the built-in Math.max() function with the spread operator: const findLargest = (...nums) => { return Math.max(...nums); }; console.log(findLargest(4, 6, 7, 2, 3)); console.log(findLargest(15, 8, 23, 1)); ...
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