非阻塞自定义错误

Question

Consider such example:

function Object(param) {
   if(param == null) throw new Error('custom error');
   return param;
}

var obj1 = new Object(1);
var obj2 = new Object();
var obj3 = new Object(3);

obj2 will block execution of whole script. Is it possible to block execution of only that particular object? If I do this:

function Object(param) {
   if(param == null) console.log(new Error('custom error'));
   return param;
}

It will execute console.log 3 times instead of log string once which is also undesired effect. Second code is non blocking but it's not error anymore.

EDIT: https://github.com/wisniewski94/sprites.js/blob/master/sprite.js

rangeErr as an example

EDIT2: turns out that if you set console.log in variable it will always call that log even without using this variable.

function Object(param) {
   var err = console.log(new Error('custom error'))
   if(param == null) err;
   return param;
}

Answer 1

I fixed this issue by using console.error() for throwing custom errors and simple return; for blocking execution of function.

Answer 2

What about:

function object(param) {
    if (param == null) {
        console.log(new Error('custom error'));
    }
    return param;
}

you can replace console.log with console.error too

also you should be careful with javascript's reserved keywords Object (with an uppercase O) is one of them (well not really a keyword but a really important object)