In this Hasty Treat, Scott and Wes talk about records and tuples in javascript — what they are, why you might want to use them, and more!

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Show Notes

??? -

02:42 - Immutability

05:08 - Records

• Immutable object
• Syntax #{x: 1, y: 2}

05:56 - Tuples

• Immutable array
• Syntax #[1,2,3,4]

07:18 - For both

• Referred to as a compound primitive

• Can contain only primitives, not objects

• They are compared deeply by their contents rather than their identity

  assert(#{ a: 1 } === #{ a: 1 }); assert(#[1, 2] === #[1, 2]); assert(#{ a: 1, b: 2 } === #{ b: 2, a: 1 });

• Potential for optimizations

  • Optimizations for making deep equality checks fast
  • Optimizations for manipulating data structures

• Works well with type systems

• Better integration with the debugger

• Accessed through normal record.scott object like syntax

13:39 - Stage 2

Links

• https://github.com/tc39/proposal-record-tuple

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