how to sum numbers in an array javascript code example

Example 1: adding numbers in an array javascript

console.log(
  [].reduce((a, b) => a + b)
)

Example 2: sum of all numbers in an array javascript

const arrSum = arr => arr.reduce((a,b) => a + b, 0)

Example 3: sum all elements in array javascript

arr.reduce((a, b) => a + b)