Destructuring Demystified

Destructuring Demystified

A Tour of clojure’s Destructuring forms by someone hopelessly unqualified.

A Tour of clojure’s Destructuring forms by someone hopelessly unqualified.

TIL Session #1TIL Session #1

What is it?

Why use it?

Where should I use them?

When should I use them?

How?

Cool tricks

What?What?“A method of positionally binding locals

based on an expected form for a composite data structure”

- The Joy of ClojureOR

“Picking out the bits you need”- Tom Crinson

Why?Why?

A lot of times you don’t need the whole structure.

Keeps code readable

Keeps functions focussed

Why?Why?

Where?Where?

let form

function parameters

When?When?

“Whenever you find yourself calling nth repeatedly, or looking up constants in a map

or using first or next, ask yourself if restructuring would be a better fit.”

- The Joy of Clojure

Vectors - RemainderVectors - Remainder

Slurp up remaining names

Vectors - :asVectors - :as

Keeps as a vector - untouched

Vectors - Associative Destructuring

Vectors - Associative Destructuring

Declare local names as indices into a vector

MapsMaps

‘Tis a bit repetitive...

And... keywords on the right?

Maps - keywordsMaps - keywords:keys

:strs

:syms ...

Maps - default Values

Maps - default Values

Cool Tricks -1Cool Tricks -1Nested Destructuring

Cool Tricks - 2Cool Tricks - 2

Works on other data structures!

FinFin