Compare array elements

Question

Is there a more elegant way in CoffeeScript to compare elements within arrays?

For "is any of these elements in the array" I do:

if "b0" in myArr or "b1" in myArr or "b1" in myArr

And for "are all of these elements in the array" I do:

if "b0" in myArr and "b1" in myArr and "b1" in myArr

Thank you very much for your help on this beginner question.

dfsq · Accepted Answer · 2015-12-19 08:57:59Z

1

For "is any of these elements in the array" I do:
if "b0" in myArr or "b1" in myArr or "b1" in myArr

It is convenient to use Array methods for this. Array.prototype.some is useful:

['b0', 'b1', 'b2'].some(function(el) {
    return myArr.indexOf(el) > -1;
});

And for "are all of these elements in the array" I do:
if "b0" in myArr and "b1" in myArr and "b1" in myArr

And here you can use Array.prototype.every:

['b0', 'b1', 'b2'].every(function(el) {
    return myArr.indexOf(el) > -1;
});

answered Dec 19, 2015 at 8:57

dfsq

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2 Comments

Esshahn Over a year ago

Thank you dfsq for that little trick. I was sure CoffeeScript had something convenient "build in", but couldn't find proper examples anymore.

dfsq Over a year ago

I'm not coffescript guy, but I don't think it has something that specific. After all, it's just normal JS. You just need to translate it to CS syntax.

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