Records and Arrays

Records and arrays are the main data structures in FScript.

Records

user = {
  id: '1',
  name: 'Ada',
  active: true,
}

Records are:

• plain data
• immutable
• structurally typed

Arrays

numbers = [1, 2, 3]

Arrays are:

• ordered
• homogeneous by default at the type level
• immutable

Updating values

Because records and arrays are immutable, updates create new values rather than changing old ones.

import Array from 'std:array'
import Object from 'std:object'

nextUser = Object.spread(user, { active: false })
nextNumbers = Array.append(4, numbers)

Comparison to JavaScript

FScript uses record and array literals that look familiar, but it does not support mutating methods or property writes. Think “plain data plus helpers,” not “objects with behavior.”