Records And Tuples Usage In React

Records & Tuples, a very interesting proposal, has just reached stage 2 at TC39. They bring deeply immutable data structures to JavaScript.

Records & Tuples, a very interesting proposal, has just reached stage 2 at TC39.

They bring deeply immutable data structures to JavaScript.

But don't overlook their equality properties, that are VERY interesting for React.

A whole category of React bugs are related to unstable object identities:

• Performance: re-renders that could be avoided
• Behavior: useless effect re-executions, infinite loops
• API surface: unability to express when a stable object identity matters

I will explain the basics of Records & Tuples, and how they can solve real world React issues.

Records & Tuples 101

This article is about Records & Tuples for React. I'll only cover the basics here.

They look like regular Objects and Arrays, with a # prefix.

const record = #{a: 1, b: 2};

record.a;
// 1

const updatedRecord = #{...record, b: 3};
// #{a: 1, b: 3};

const tuple = #[1, 5, 2, 3, 4];

tuple[1];
// 5

const filteredTuple = tuple.filter(num => num > 2)
// #[5, 3, 4];

They are deeply immutable by default.

const record = #{a: 1, b: 2};

record.b = 3;
// throws TypeError

They can be seen as "compound primitives", and can be compared by value.

VERY IMPORTANT: two deeply equal records will ALWAYS return true with ===.

{a: 1, b: [3, 4]} === {a: 1, b: [3, 4]}
// with objects => false

#{a: 1, b: #[3, 4]} === #{a: 1, b: #[3, 4]}
// with records => true

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