Javascript Arrow Function 2

No parameter amount arrow function

If the function does not have arguments, we can say by (), is not some force lattice, see example

Const FULLNAMES5 = Names.map (() = ' Cool Bos '); Console.log (FULLNAMES5); Cool Bos, cool Bos, cool BOS

There is another way to do this is to use the underscore _ instead of ()

Names.map (_=> ' Cool Bos ');

Of course, this underline doesn't make any sense, you can do it, but it doesn't mean anything.

Names.map (x = ' cool bos '), names.map (Wesbos = ' cool Bos '), names.map (_ya___yayayayay = ' cool bos '); Names.map ( Do_yaget_the_point = ' Cool Bos ');

An arrow function is an anonymous function

Look at a function with a name saymyname.

function Saymyname (name) {  alert (' Hello ${name} ');}

　　

A named function is handy for coder to find errors and clear functions.

But the arrow function is an anonymous function, what should I do? We can use a variable, for example:

Const SAYMYNAME = (name) + {alert (' Hello ${name}! ')}saymyname (' Wes ');

　　

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Javascript Arrow Function 2