String functions to find Contains and to Replace in Javascript

Below I described two string javascript functions that I often forget. 

"If string Contains" in Javascript you can determine using "indexOf()" command.

If substring is not found, the result is -1. That’s why it’s better to compare with "-1":


To replace substring you should use String.Replace command. The syntax to replace the word "World" to nothing ('') is like this:

The result is "Hello ".

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