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JavaScript JavaScript Loops, Arrays and Objects Tracking Multiple Items with Arrays Removing Items From Arrays

Adam Maley
Adam Maley
5,946 Points
Posted by Adam Maley
Adam Maley
5,946 Points

Unshift vs shift...poor choice of naming.

Why does it seem that taking an item off of the front should be Unshift? And putting on on top the front should be Shift?

3 Answers

Martin Lecke
Martin Lecke
14,385 Points
Martin Lecke
Martin Lecke
14,385 Points

Personally i think it feels really weird to call something UN to put something in first order in array. There are some weird stuff about the good ol' javascript.

Not sure if you have started with dates and the Date() object. But months starts to count from 0-11 but days starts at 1, was very confusing at first

Adam Maley
Adam Maley
5,946 Points
Adam Maley
Adam Maley
5,946 Points

I have not started with dates but yeah that sounds odd as well.

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

My guess is that when you remove the first item, it "shifts" all the other items up. And "unshift" just because it does the opposite of "shift".

If you'd been part of the initial development team, what would you have named those functions?

I always thought "push" and "pop" were an odd pair. I'd probably have named them "push" and "pull" instead.

Adam Maley
Adam Maley
5,946 Points
Adam Maley
Adam Maley
5,946 Points

Yeah I'm not sure, they both just seem strange.

kevinardo
seal-mask
.a{fill-rule:evenodd;}techdegree
kevinardo
Treehouse Project Reviewer
kevinardo
.a{fill-rule:evenodd;}techdegree
kevinardo
Treehouse Project Reviewer

The best way for me to remember them was thinking that unshift and push both have the letter u in them and that they add to the array. And then it was easier to remember that shift and pop is the opposite and removes . It really helped sorting them out this way, but still it was some trial and error to remember them.