Member Technical Team Interview Questions and Answers

map creates a new array with the results of calling a provided function on every element, forEach executes a provided function once for each array element.

• map returns a new array with the results of the provided function, forEach does not return anything

• map does not modify the original array, forEach can modify the original array

• Example: const numbers = [1, 2, 3]; numbers.map(num => num * 2); // returns [2, 4, 6]; numbers.forEach(num => console.log(num)); // prints 1, 2, 3

Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.

• Start with two initial numbers, usually 0 and 1

• Add the previous two numbers to get the next number in the sequence

• Repeat this process to generate the Fibonacci series