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Accepted
Pedro
Asked: 2022-05-31 14:47:30 +0800 CST 2022-05-31 14:47:30 +0800 CST

functions in js

  • 772

The following code throws an error in the browser console

sayHello(firstName, lastName){
 
let msg = "Greetings ";
 
function intro(){
 
return
 
msg + firstName = " " + lastName;
 
}
 return into();
}
sayHello("Professor" , "Falken");
 
//returns "Greetings Professor Falken";

After the comment lines is what should come out. However an error is declared, indicating that the first key is an unexpected token. I need an explanation to correct the code.

funciones

2 Answers

  1. you need to indicate "function":

    sayHello(firstName, lastName){

    should be:

    function sayHello(firstName, lastName){

    this part will not return anything because you are putting an empty return before doing any operations.

    function intro(){


return


msg + firstName = " " + lastName;}

    An example to do what you propose in a simpler way would be:

    function sayHello(firstName, lastName){
   return 'Greetings ' + firstName + ' ' + lastName;
}

    I hope I've helped,

    Greetings.

    • 1
  2. Best Answer

    There are several bugs in that code.

    The first is that you declare the called function introbut then call it with the name into.

    The second error is the way you are trying to create the message.

    The correct way to do it is like this:msg = msg + firstName + " " + lastName;

    I mean, there you tell it that the new value of msgmust be what it currently has msg("Greetings") concatenated with firstNamethen with the space (" ") and finally with the lastName.

    The third error, as they already told you, is that the word functiona is missing sayHello.

    This is important, since when declaring a function you always have to use the word functionor, failing that, the arrow function () => {}. Then when you call the function there, it is not necessary to add that and you call the function only with its name and the parentheses.

    The fourth and last mistake, which has also been flagged for you, is to make sure you put what you want to return in a function always next to the return, never below. If not, by putting it down, you returnwill end up with it returning a value undefined.

    Run the following fixed code and you will see the result you were expecting:

    function sayHello(firstName, lastName){
 
  let msg = "Greetings ";

  function intro(){

    return msg = msg + firstName + " " + lastName;

  }
  return intro();
}


document.write(sayHello("Professor" , "Falken"))
//returns "Greetings Professor Falken";

    PS: Please consider marking an answer "accepted" in case it was helpful to you. This will help others who have problems similar to yours know that an answer is effective. Here's how to do it .

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