Keyword Analysis & Research: javascript function parameters undefined

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Frequently Asked Questions

What happens if a parameter is undefined?

If b parameter is undefined, let default it to 2: The function is invoked with a single argument multiply (5). Initially, a parameter is 2 and b is undefined. The conditional statement verifies whether b is undefined.

What are the parameters of a JavaScript function?

The parameters, in a function call, are the function's arguments. JavaScript arguments are passed by value : The function only gets to know the values, not the argument's locations. If a function changes an argument's value, it does not change the parameter's original value.

What is the meaning of isUndefined in JavaScript?

Basically, undefined represents value, which are not defined formally by user. Consider your example : var isUndefined = function (obj) { return typeof obj == 'undefined'; }; So, isUndefined () when invoked without any argument, then the value of obj will be undefined in the function.

What happens if you call a function without a parameter?

If you call the function without parameter like this swapCase () then you basically pass undefined to this function and that is assign to letter. You can do a quick check at the beginning of the function to check for that. It is defined here — function (letters) { — as an argument name on the function.

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