What is the isNaN function?

The isNaN function is a global method. It is used to test whether or not an expression is a number. The value returned by this function is boolean. The isNaN function evaluates the parameter and returns true if the value is not a number.

The syntax of using the isNaN method is as follows:

isNaN(value)

For example:

trace(isNaN”two”)// output: true
trace(isNaN(33))//output: false

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