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Week 3 · 8–10 hours

Arrays, Objects & Data

Work with real application data

Model collections and records, then transform them without losing clarity or correctness.

Daily study plan

1

Arrays & indexing + Array mutation

55 min

Start
2

Objects & methods + Nested data + Destructuring

90 min

Start
3

Spread, rest & immutability + map, filter & find + reduce, sort & analysis

90 min

Start
4

Practice Lab

45 min

Start
5

Expense Tracker Data Engine + Assessment

90 min

Start

All lessons

01

Arrays & indexing

25 min · Build a practical mental model for arrays & indexing and use it in working JavaScript.

02

Array mutation

30 min · Build a practical mental model for array mutation and use it in working JavaScript.

03

Objects & methods

35 min · Build a practical mental model for objects & methods and use it in working JavaScript.

04

Nested data

25 min · Build a practical mental model for nested data and use it in working JavaScript.

05

Destructuring

30 min · Build a practical mental model for destructuring and use it in working JavaScript.

06

Spread, rest & immutability

35 min · Build a practical mental model for spread, rest & immutability and use it in working JavaScript.

07

map, filter & find

25 min · Build a practical mental model for map, filter & find and use it in working JavaScript.

08

reduce, sort & analysis

30 min · Build a practical mental model for reduce, sort & analysis and use it in working JavaScript.