indexOf()
ES5+Returns the first index at which a given element can be found in the array.
Syntax
array.indexOf(searchElement, fromIndex)Parameters
searchElement any Element to locate in the array
Return Value
number
The index of the element, or -1 if not found
Examples
JavaScript
const fruits = ['apple', 'banana', 'cherry'];
console.log(fruits.indexOf('banana'));
console.log(fruits.indexOf('mango'));Output:
// 1
-1