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Syntax for string.indexOf(searchValue[, fromIndex]) displays comma inside a square bracket?

About the syntax mentioned in the website https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String/indexOf

They have mentioned the syntax for indexOf like this

string.indexOf(searchValue*[, fromIndex]*)

where the comma is in between the sqaure brackets, but when we use the function the value is entered is after the comma.

Is this a kind of standard methodology for showing the syntax?

Solution

  • Yes, it's fairly standard. Items appearing inside [] brackets are optional. If you're not going to provide the second parameter, then you don't supply the comma either.

    You wouldn't write indexOf('abc',);