TruKKer Interview Questions and Answers

A mountain array is an array that increases to a peak and then decreases.

• Check if the array has a peak where all elements before the peak are in increasing order and all elements after the peak are in decreasing order.

• Example: ['1', '2', '3', '4', '5', '4', '3', '2', '1'] is a mountain array.

• Example: ['1', '2', '3', '4', '5', '5', '4', '3', '2', '1'] is not a mountain array.

let is block scoped, const is constant, var is function scoped

• let: block scoped, can be reassigned, not hoisted

• const: block scoped, cannot be reassigned, not hoisted

• var: function scoped, can be reassigned, hoisted

• Example: let x = 10; const y = 20; var z = 30;