1var objs = [
2 {name: "Peter", age: 35},
3 {name: "John", age: 27},
4 {name: "Jake", age: 28}
5];
6
7objs.reduce(function(accumulator, currentValue) {
8 return accumulator + currentValue.age;
9}, 0); // 35 + 27 + 28 = 90
1var arr = [{x:1},{x:2},{x:4}];
2
3arr.reduce(function (a, b) {
4 return {x: a.x + b.x}; // returns object with property x
5})
6
7// ES6
8arr.reduce((a, b) => ({x: a.x + b.x}));
9
10// -> {x: 7}