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Indexof javascript software#

Note: Index position always starts from 0. Whereas if we pass not existed value to the indexOf() method, it will return -1. It will return the actual index position. Var indexOfBookNotExisted=searchIndex(book2) ĭocument.write(book1+" position is :"+indexOfBook+"") ĭocument.write(book2+" position is :"+indexOfBookNotExisted) Īs we can observe from the output we can clearly see if we pass existed items from an array is given to the indexOf() method.

Searching the index of a book from an array (without mentioning a position): Below example, we do not specify any position within the indexOf() method so, the search starts at the 0 th. The examples of the following are given below: Example #1

Starting position: Pass the number to, where to start the searching operation.

Item: Pass the required item from an array.

While searching the specified item in the indexOf() method, if an item present more than once then indexOf() method returns first occurred item from the list.Īrray_Name.indexOf (item,starting position) Like indexOf(“any value or string”,1(position)). Let suppose if we did not mention any start position then the search starts from the 0 th index. The search will begin at the given position through the indexOf() method. If the item is not found, it returns -1 value. JavaScript indexOf() method always works for the search operation.

Indexof javascript software#

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