sum if the epecefic value is true in array object code example

Example 1: javascript sum array of objects

arr = [{x:1}, {x:3}]

arr.reduce((accumulator, current) => accumulator + current.x, 0);

Example 2: js sum of array

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

// Output: 10