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JavaScript Introduction to Programming Control Structures Loops

Sukhraj Grewal
Sukhraj Grewal
10,554 Points
Posted by Sukhraj Grewal
Sukhraj Grewal
10,554 Points

Code doesn't do what i expected it to do

for ( var counter = 5; counter; counter = counter -1) {
  alert("Hello WOrld", counter);
}

This suppose to alert Hello world with counter at the end 10 times and every time counter gets - 1 .

But after i run this code this alerts hello world 10 times but doesn't display the counter

Any Help ?

3 Answers

Sean T. Unwin
Sean T. Unwin
28,690 Points
Sean T. Unwin
Sean T. Unwin
28,690 Points

alert() takes only 1 argument. If you want to see counter displayed use the following format:

alert("Hello World " + counter);

console.log(), which is used in the video, does take comma separated objects to be output:

console.log("Hello World", counter);
Bryan Jenkins
Bryan Jenkins
5,438 Points
Bryan Jenkins
Bryan Jenkins
5,438 Points

Try this out. Javascript uses the + symbol to concatenate a string. 

for (var counter=5; counter; counter--) {
  alert("Hello World " + counter);
}