javascript reduce array of objects subtraction code example

Example 1: reduce object to array javascript

var arr = [{x:1},{x:2},{x:4}];

arr.reduce(function (a, b) {
  return {x: a.x + b.x}; // returns object with property x
})

// ES6
arr.reduce((a, b) => ({x: a.x + b.x}));

// -> {x: 7}

Example 2: syntax of reduce in js

[1,2,3,4,5].reduce((acc, current)=>acc+current, 0)