Why does printing this variable show a prompt, instead of an error message?

Question

Please why does console.log(theMessage) show a popup prompt, instead of: "You typed" + textTypedIntoPrompt.

Or even some error message related to it?

New to programming and just trying to understand why this program works the way that does.

Thanks.

var textTypedIntoPrompt = prompt ("Type some text");

var theMessage = "You typed" + textTypedIntoPrompt;

console.log(theMessage);

Answer 1

it's not the console.log which open the popup prompt, it's the prompt function

the log is then done in the console as shown in the snippets below

var textTypedIntoPrompt = prompt("Type some text");
var theMessage = "You typed : " + textTypedIntoPrompt;
console.log(theMessage);

here's a detailled explanation of what happens

var textTypedIntoPrompt =                              
// create a variable named textTypedIntoPrompt
                          prompt("Type some text");    
// open the popup prompt
// the popup prompt freeze the execution until the prompt was confirmed or dismissed
// once the prompt is confirmed/dismissed the function returns
// either what the user wrote (if confirmed) or null (if dismissed)

// when you're here textTypedIntoPrompt contains the input
// and your browser already forgot it came from a prompt

var theMessage =                                       
// then you create a variable named theMessage
                 "You typed : " + textTypedIntoPrompt; 
// and you assign to it the string 'you typed : ' followed by the value of textTypedIntoPrompt
// (which is the return value of prompt) 

console.log(theMessage);
// finally you print this string into the console 
// use ctrl+shift+k to open the console in most browsers

---

and finally a snippet proving console.log doesn't open a prompt

console.log("didn't open a prompt :)")

while this one proves prompt does open a prompt (as it's name is telling us)

prompt("I opened a prompt", "you can also set a default value")
// the return value is not saved into a variable so it is lost