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My New Friends filter() and map()

SavagePixie on July 24, 2019

Today I have been learning about arrow functions. I've got to say that at first it's hard to wrap my head around the idea that a function can take ...
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Adam Crockett 🌀 • Edited

.some and .every are amazing too, also .reduce. All the functors rock. Also Array.from

This is a nifty trick too, pass a Boolean construtor to clean an array of all falsely or holes, return only truthy values.

["", 0, "HEY", , null, -Infinity]
    .filter(Boolean) // => ["Hey"]

Lastly .find is just like filter but returns one value rather than an array.

Ps.
I think all the functors are based on reduce.

PSS.
This is functional programming where this expression is preferred over statements like if and for. You will be surprised how much you can get away with.

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SavagePixie

Ooh! New toys! I'll have to check them and see what they do.

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Lee

Incredible how there's still things to learn. I will definitely start looking at ways to through in this nifty trick, and that .find too! Thanks!

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Adam Crockett 🌀

Looks like I should do a post on JavaScript arrays

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Jere Suikkila

They're amazing. Not a day goes by without me writing one of these! I love how easy they are to write and how understandable they are to read afterwards to know what a piece of code does.

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Dave Jacoby

I was about to say that, if you like map and filter, you'll love reduce, but it's been said...

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SavagePixie

I've looked at it a bit, but I think it'll be tomorrow's trouble, hehe

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Dave Jacoby

It'll be there when you get to it.

In my language of choice, Perl, map exists, filter is grep, and reduce comes from a non-standard library. It still fills me with joy.

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Praneet Nadkar

The explanation was neat!

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webdeasy.de

Good explanation and examples! 😊

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Adam Crockett 🌀

Groovy well that's straightend out. 😅

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Yashwanth

These are my enemies from today onwards.. haha