How to Loop Through an Array of Objects in JavaScript?
Loop through an array of objects in JavaScript. We are going to explore two different methods for looping over an array of objects in JavaScript. One method creates a copy of each object and uses it as the loop variable and key-value pair; while another method creates a new array and iterates over every item in it with a for each operation.
iterate over array of objects javascript
By 
Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Transform to a new array
const myArray = [{x:100}, {x:200}, {x:300}];
const newArray= myArray.map(element => element.x);
console.log(newArray); // [100, 200, 300]
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Find an element in an array
const people = [ {name: "john", age:23},
{name: "john", age:43},
{name: "jim", age:101},
{name: "bob", age:67} ];
const john = people.find(person => person.name === 'john');
console.log(john);
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Just loop through an array
const myArray = [{x:100}, {x:200}, {x:300}];
myArray.forEach((element, index, array) => {
console.log(element.x); // 100, 200, 300
console.log(index); // 0, 1, 2
console.log(array); // same myArray object 3 times
});
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Check if any of the elements in an array pass a test
const people = [
{name: 'John', age: 23},
{name: 'Andrew', age: 3},
{name: 'Peter', age: 8},
{name: 'Hanna', age: 14},
{name: 'Adam', age: 37}];
const anyAdult = people.some(person => person.age >= 18);
console.log(anyAdult); // true
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Create a new array based on the original but without modifying it
const myArray = [{x:100}, {x:200}, {x:300}];
const newArray= myArray.map(element => {
return {
...element,
x: element.x * 2
};
});
console.log(myArray); // [100, 200, 300]
console.log(newArray); // [200, 400, 600]
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Sort an array
const people = [
{ name: "John", age: 21 },
{ name: "Peter", age: 31 },
{ name: "Andrew", age: 29 },
{ name: "Thomas", age: 25 }
];
let sortByAge = people.sort(function (p1, p2) {
return p1.age - p2.age;
});
console.log(sortByAge);
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// 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
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Retrieve a subset of an array based on particular criteria
const myArray = [{x:100}, {x:200}, {x:300}];
const newArray = myArray.filter(element => element.x > 250);
console.log(newArray); // [{x:300}]
Source: stackoverflow.com
0
iterate over array of objects javascript
By Shan Thiru
on Jan 02, 2021
Shan Thiru
on Jan 02, 2021
// Count the number of each category
const people = [
{name: 'John', group: 'A'},
{name: 'Andrew', group: 'C'},
{name: 'Peter', group: 'A'},
{name: 'James', group: 'B'},
{name: 'Hanna', group: 'A'},
{name: 'Adam', group: 'B'}];
const groupInfo = people.reduce((groups, person) => {
const {A = 0, B = 0, C = 0} = groups;
if (person.group === 'A') {
return {...groups, A: A + 1};
} else if (person.group === 'B') {
return {...groups, B: B + 1};
} else {
return {...groups, C: C + 1};
}
}, {});
console.log(groupInfo); // {A: 3, C: 1, B: 2}
Source: stackoverflow.com
0
This means that you no longer have to be concerned so much about initializing a variable before using it, as arrays automatically reset their size when assigned values or used in other ways.
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