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Hadi Farhat
10,678 PointsShouldn't const button throw an error after the first loop because It's already been defined?
for(var i = 0; i < buttons.length; i++) {
const button = buttons[i];
button.addEventListener("click", function() {
alert("Button " + i + " Pressed");
});
}
Why const button = buttons[i] is not throwing an error? Constants can't be changed, so why does it work in this case?
2 Answers
Steven Parker
231,269 PointsThe loop's block is exited and re-entered for each iteration, so the const gets disposed and re-created each time.
remedies
3,616 PointsIf you had defined const outside the loop, and reassigned a value, you'd get an error, in this case, "const" is used each "reassignment" so that it is overwritten.
richi ramos
593 Pointsrichi ramos
593 PointsHello Steven, did you started learning at Treehouse? I saw you have a lot of points. Did you become a senior software architect thanks to the courses from this platform? did you get a job because of this learning ? Thanks.
Steven Parker
231,269 PointsSteven Parker
231,269 PointsHi Richi,
I was a software developer before I discovered treehouse, but I really have enjoyed using it to learn new skills and keep up to date on recent developments in evolving web technologies. One thing I did learn from scratch here is the Python language. I find the quality of the instruction combined with interspersed quizzes and challenges very effective for learning.