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By: fyvo July 27, 2025 JavaScript

Description

This function calculates the sum of all numbers within a JavaScript array. It handles empty arrays gracefully and non-numeric elements.

Code Snippet

function sumArray(arr) {
  if (!arr || arr.length === 0) {
    return 0; 
  }
  let sum = 0;
  for (let i = 0; i < arr.length; i++) {
    if (typeof arr[i] === 'number') {
      sum += arr[i];
    }
  }
  return sum;
}

// Example usage:
const numbers = [1, 2, 3, 4, 5];
const sum = sumArray(numbers);
console.log("Sum of array:", sum); // Output: Sum of array: 15

const mixedArray = [1, 2, 'a', 4, 5];
const mixedSum = sumArray(mixedArray);
console.log("Sum of mixed array:", mixedSum); // Output: Sum of mixed array: 12

const emptyArray = [];
const emptySum = sumArray(emptyArray);
console.log("Sum of empty array:", emptySum); // Output: Sum of empty array: 0

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