Throw custom Error Assert

By checking for errors and then throwing exceptions, many developers create their own assert functions, many of which have built-in assert methods, and are actually very handy to create.

function assert (!bcondition,serrormessage) {

if (!bcondition) {

throw new Error (serrormessage);

}

}

How to use:

function Divide (inum1,inum2) {

ASSERT (Argument.length = 2, "divide () requires two arguments.");

Assert (typeof iNum1 = = "Number" &&typeof iNum2 = = "Number", "divide () requires two for numbers.");

return inum1.valueof ()/inum2.valueof ();

}

As you can see, this reduces the amount of code in the Divide () function, and developers are more clear about what to think when writing the function.