concat() Method in JavaScript
•JavaScript•1 min read
javascriptconcat method in javascriptarray methods
concat() is a built-in method in JavaScript that is used to merge two or more arrays together and return a new array with the combined elements.
concat() Method in JavaScript
concat()is a built-in method in JavaScript that is used to merge two or more arrays together and return a new array with the combined elements.- It doesn't modify the original array.
Example:
- Let's create two arrays:
form1andform2.
let form1 = ['firstName', 'lastName'];
let form2 = ['phoneNumber', 'email'];To merge these arrays, use the concat() method:
let formData = form1.concat(form2);
document.write("Form Data: " + formData.join(", ") + "<br>");
// Output:
Form Data: firstName, lastName, phoneNumber, emailThe formData array contains the elements of both form1 and form2.
- Now, let's create two variables:
salaryanddepartment.
let salary = 50000;
let department = 'finance';To merge these variables with formData, use the concat() method again:
let newFormData = formData.concat(salary, department);
newFormData.forEach(item => {
document.write(item + "<br>");
});
// Output:
firstName
lastName
phoneNumber
email
50000
financeThe newFormData array contains all elements of formData along with salary and department.
- Using the
concat()method, we can merge arrays and individual elements to create a new array.
