静默 JS 中未使用的变量警告

Question

My typescript compiler keeps complaining about unused variables. In C, I would use

void foo(int bar)
{
    (void)bar;
}

Is there a JavaScript equivalent?

Answer 1

in the TSConfig file you can set "no-unused-variable": true that will make it stop complain about all the unused variables in the entire project

You can also put an underscore before the variable name if you want TS to ignore only that specific unused variable like this:

function foo(_bar:number) {
  return 0;
}

Answer 2

A somewhat ugly, but fully functional way, is to simply use the variable for something.

Don't know much about Typescript, but this silences warnings in C:

void foo()
{
    int dummy=42;
    int x=dummy;
    dummy = x;
}

I guess you could use something similar.

Or as Luke_ pointed out in comments, you can give the variable a name that starts with _