在Javascript中使用回调参数创建函数

Question

I want to create "foo" function which has a callback as argument, and also wanted the callback to have two arguments as mentioned below. I tried, but didn't get a solution yet.

it doesn't have any usecase it's just a challenge for myself :)

function foo(callback){
      callback();
}
foo((arg1,arg2)=> {
      arg1=0;
      arg2=1;
});

what should i do?

Answer 1

The arguments passed to the callback are created by the function calling it , so in your case foo does that:

 function foo(callback){ callback(/*arg1: */ 0, /* arg2: */ 1); } foo((arg1,arg2) => { console.log("arg1 is", arg1, "arg2 is", arg2); }); 

You call a callback just like you call any other function.

Answer 2

fixed.

this is what i learned and i want to share with you, to create a simple callback function we can write:

function foo(DoSomeThing){
     DoSomeThing();
}

and to test that :

foo(function(){
      console.log(`Hello world`);
});

this function didn't have any arguments, so if we want to add arguments we shuold do something like :

function foo2(doSomeThing){
      doSomeThing(argument1=0,argument2=0);
}

and to test that :

foo2((arg1,arg2) => {
      console.log(`arg1 : ${arg1} and arg2 : ${arg2}`);
});

in this case answer is : arg1 : 0 and arg2 : 0

in the first example i used callback function and in the second one i used arrow function.it depends on you to choose any of them...