_01_sum_of_the_array_element.js

// 1. Sum of the Array element
/**
 * Pattern Used: Linear Traversal / Accumulator Pattern
 * Why this pattern: Summing elements only requires a single pass while accumulating a running total, with no need for extra data structures or multiple passes.
 *
 * Interview Scenario:
 * "Asked as a warm-up question in almost every SDE-1 phone screen: 'Given an array of daily expenses, write a function to compute the total spend.' Interviewers use it to check basic loop/array fluency before moving to harder patterns."
 *
 * Example:
 *   Input:  [1, 2, 3, 4, 5]
 *   Output: 15
 */