javascript add number in array code example

Example 1: sum of number using reduce

console.log(
  [1, 2, 3, 4].reduce((a, b) => a + b, 0)
)
console.log(
  [].reduce((a, b) => a + b, 0)
)

Example 2: javascript array add

// example:
let yourArray = [1, 2, 3];
yourArray.push(4); // yourArray = [1, 2, 3, 4]

// syntax:
// <array-name>.push(<value-to-add>);