iterate in object of arrays javascript code example

Example 1: iterate through object array javascript

for (var key in array) {
    var obj = myArray[key];
    // ...
}

Example 2: iterate over array of objects javascript

// Sum up a particular property, and calculate its average

const myArray = [{x:100}, {x:200}, {x:300}];

const sum = myArray.map(element => element.x).reduce((a, b) => a + b, 0);
console.log(sum); // 600 = 0 + 100 + 200 + 300

const average = sum / myArray.length;
console.log(average); // 200