How to use JavaScript Array indexOf()

Array indexOf() method

Program to use JavaScript Array indexOf() method

let a = ["HTML","CSS","JavaScript"];
    let b = a.indexOf("CSS");
    console.log(b);
    

Output

1
    

Steps Description

• Declare two variable a and b
• Initialize two variable with value of array a = [“HTML”,”CSS”,”JavaScript”] and b = a.includes(“CSS”)
• Array IndexOf() method returns the index value of the array if it is found in the given array and returns -1 if it is not found.
• The value of b variable is displayed with the help of console.log inbuilt function