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14 Awesome JavaScript Array Tips You Should Know About

Kai on December 09, 2020

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Jon Randy 🎖️ • Dec 10 '20

An easier way to copy an array:

const fruitsA = ["🍎", "🍌", "🍒"];
const fruitsB = [...fruitsA];

Amir Hameed • Dec 13 '20

I was also looking if this method is mentioned in the article.

Vladimir • Dec 12 '20

Thank you for the nice tips!

How to Remove All Falsy Values From an Array

You can also use simple coercion to Boolean

const fruits = ["🍎", false, "🍌", undefined, "🍒"];

const filteredFruits = fruits.filter(Boolean);

Daniel Hillmann • Dec 13 '20

Was about to suggest this as well. Much cleaner to me :-)

kamcio • Dec 14 '20 • Edited

Please don't use emojis.
When your browser doesn't render emojis you get Replacement Glyph.

Kai • Dec 14 '20

Thanks for your feedback! What browser are you using?

kamcio • Dec 15 '20

Latest Chrome on Win7 with almost all fonts deleted.

Szymon Dziewoński • Mar 4 '21 • Edited

You should probably write that copying array/object with spread operator/slice/object.assign/json technique is just shallow copying - which is important information. Also you can use Object.assign([], [your array]) and another one JSON.parse(JSON.stringify([your array])) (but I would not recommend it to you) :)