Javascript Program for Leaders in an array Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Write a program to print all the LEADERS in the array. An element is leader if it is greater than all the elements to its right side. And the rightmost element is always a leader. For example int the array {16, 17, 4, 3, 5, 2}, leaders are 17, 5 and 2. Let the input array be arr[] and size of the array be size.Method 1 (Simple):Use two loops. The outer loop runs from 0 to size - 1 and one by one picks all elements from left to right. The inner loop compares the picked element to all the elements to its right side. If the picked element is greater than all the elements to its right side, then the picked element is the leader. JavaScript // Javascript Function to print leaders in an array function printLeaders(arr, size) { let output = ''; for (let i = 0; i < size; i++) { let j; for (j = i + 1; j < size; j++) { if (arr[i] <= arr[j]) break; } if (j == size) // the loop didn't break output += arr[i] + ' '; } console.log(output); } // driver code let arr = [16, 17, 4, 3, 5, 2]; let n = arr.length; // Function calling printLeaders(arr, n); Output17 5 2 Complexity Analysis:Time Complexity: O(n*n)Auxiliary Space: O(1)Method 2 (Scan from right):Scan all the elements from right to left in an array and keep track of maximum till now. When maximum changes its value, print it.Below image is a dry run of the above approach:Below is the implementation of the above approach: JavaScript /* JavaScript Function to print leaders in an array */ let output=''; function printLeaders(arr, size) { let max_from_right = arr[size - 1]; /* Rightmost element is always leader */ console.log(max_from_right + " "); for (let i = size - 2; i >= 0; i--) { if (max_from_right < arr[i]) { max_from_right = arr[i]; console.log(max_from_right + " "); } } } /* Driver program to test above function*/ let arr = [16, 17, 4, 3, 5, 2]; let n = arr.length; printLeaders(arr, n); Output2 5 17 Complexity Analysis:Time Complexity: O(n)Auxiliary Space: O(n), the extra space is used to store the elements of max_from_right array.Please refer complete article on Leaders in an array for more details! Comment More infoAdvertise with us K kartik Follow Improve Article Tags : JavaScript Amazon Payu Practice Tags : AmazonPayu Explore JavaScript Tutorial 8 min read JavaScript BasicsIntroduction to JavaScript 4 min read JavaScript Versions 2 min read How to Add JavaScript in HTML Document? 3 min read JavaScript Syntax 6 min read JavaScript Output 4 min read JavaScript Comments 2 min read JS Variables & DatatypesVariables and Datatypes in JavaScript 6 min read Global and Local variables in JavaScript 4 min read JavaScript Let 6 min read JavaScript const 5 min read JavaScript Var Statement 7 min read JS OperatorsJavaScript Operators 5 min read Operator precedence in JavaScript 2 min read JavaScript Arithmetic Operators 5 min read JavaScript Assignment Operators 5 min read JavaScript Comparison Operators 5 min read JavaScript Logical Operators 5 min read JavaScript Bitwise Operators 5 min read JavaScript Ternary Operator 4 min read JavaScript Comma Operator 2 min read JavaScript Unary Operators 4 min read JavaScript in and instanceof operators 3 min read JavaScript String Operators 3 min read JS StatementsJavaScript Statements 4 min read JavaScript if-else 3 min read JavaScript switch Statement 4 min read JavaScript Break Statement 2 min read JavaScript Continue Statement 1 min read JavaScript Return Statement 4 min read JS LoopsJavaScript Loops 3 min read JavaScript For Loop 4 min read JavaScript While Loop 3 min read JavaScript For In Loop 3 min read JavaScript for...of Loop 3 min read JavaScript do...while Loop 4 min read JS Perfomance & DebuggingJavaScript | Performance 4 min read Debugging in JavaScript 4 min read JavaScript Errors Throw and Try to Catch 2 min read JS ObjectObjects in Javascript 4 min read Object Oriented Programming in JavaScript 3 min read JavaScript Objects 6 min read Creating objects in JavaScript 5 min read JavaScript JSON Objects 3 min read JavaScript Object Reference 4 min read JS FunctionFunctions in JavaScript 4 min read How to write a function in JavaScript ? 4 min read JavaScript Function Call 2 min read Different ways of writing functions in JavaScript 3 min read Difference between Methods and Functions in JavaScript 3 min read Explain the Different Function States in JavaScript 3 min read JavaScript Function Complete Reference 3 min read JS ArrayJavaScript Arrays 7 min read JavaScript Array Methods 7 min read Best-Known JavaScript Array Methods 6 min read Important Array Methods of JavaScript 7 min read JavaScript Array Reference 4 min read Like