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SKILL JOURNEY

TypeScript

JS with superpowers

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Typed Variable
+70 XP · Annotate types.
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CHAPTER 01
Foundations
Lay the groundwork
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1YOU ARE HERE
Lesson 1+70 XP
Typed Variable
Annotate types.
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2
Lesson 2+60 XP
Number Type
Numeric.
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3
Lesson 3+60 XP
Boolean Type
True / false.
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4
Lesson 4+80 XP
Array Type
Typed list.
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5
Lesson 5+90 XP
Tuple
Fixed-shape array.
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CHAPTER 02
Core Concepts
Build the core skills
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6
Lesson 6+100 XP
Typed Function
Annotate params and return.
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Lesson 7+90 XP
Interface
Shape of object.
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8
Lesson 8+80 XP
Type Alias
Name a type.
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9
Lesson 9+90 XP
Union
One of several.
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10
Lesson 10+90 XP
Optional Property
?: makes it optional.
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CHAPTER 03
Building Blocks
Wire things together
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11
Lesson 11+100 XP
Readonly
Immutable field.
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12
Lesson 12+90 XP
Enum
Named constants.
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13
Lesson 13+130 XP
Generic
Reusable types.
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14
Lesson 14+130 XP
Class with Types
OOP with types.
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15
Lesson 15+120 XP
Type Guard
Narrow with typeof.
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CHAPTER 04
Advanced Patterns
Level up your craft
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16
Lesson 16+110 XP
Type Assertion
Tell the compiler.
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17
Lesson 17+100 XP
Intersection
Combine types.
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18
Lesson 18+100 XP
Literal Type
Exact value type.
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19
Lesson 19+110 XP
Partial
All fields optional.
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20
Lesson 20+110 XP
Pick
Subset of keys.
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CHAPTER 05
Mastery
Master the language
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21
Lesson 21+110 XP
Omit
Remove keys.
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22
Lesson 22+110 XP
Record
Map type.
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23
Lesson 23+100 XP
Unknown
Safer any.
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24
Lesson 24+120 XP
Never
Impossible type.
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TypeScript Master
24 lessons left to claim the crown