Coding Track: Data Structures - Typing Practice Lesson
Objects, arrays, and accessors
Advanced Skills
Focus Keys:
{
}
[
]
:
,
Next: c, left middle
0
WPM
100%
Accuracy
0
Errors
0%
Progress
const user = { id: 1, name: "Ada" }; const list = [1,2,3]; list[0]; const map = { a: [1, 2], b: { c: 3 } }; user.name; map.b.c; list.push(4); const keys = Object.keys(user); const pairs = [["x", 1], ["y", 2]]; data["id"] = 7; const { id, name } = user; const [first, ...rest] = list;
Quick start
- Click the text area above.
- Type the shown text. Prioritize accuracy.
- Use Backspace to correct mistakes.
Tip: Objects & Arrays
Maintain consistent punctuation: colons for keys, commas between items, brackets for indices.