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ES6 - Array Method forEach()
indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
Syntax
array.indexOf(searchElement[, fromIndex]);
Parameters
searchElement − Element to locate in the array.
fromIndex −The index at which to begin the search. Defaults to 0, i.e. the whole array will be searched. If the index is greater than or equal to the length of the array, -1 is returned.
Return Value
Returns the index of the found element.
Example
var index = [12, 5, 8, 130, 44].indexOf(8);
console.log("index is : " + index )
Output
index is : 2
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