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TypeScriptFunctions & Function Types

25 items

1

Optional Parameter Ordering

Code Quiz
2

Function Type Expression Syntax

Code Quiz
3

Rest Parameters Type Annotation

Code Quiz
4

Contextual Typing of Callback Parameters

Code Quiz
5

Inferred Return Type From Function Body

Code Quiz
6

Function Assigned to a Typed Variable

Code Quiz
7

Passing Wrong Argument Type

Code Quiz
8

Too Many or Too Few Arguments

Code Quiz
9

Typing Arrow Functions

Code Quiz
10

Named Function Declaration Types

Quiz
11

Anonymous Function Contextual Typing

Quiz
12

Typing Callback Parameters

Quiz
13

void Return Type

Quiz
14

Rest Parameters Typing

Quiz
15

Function Expression Type Annotations

Quiz
16

Return Type Inference

Quiz
17

Arrow Function Type Annotations

Quiz
18

Function Declaration Syntax

Flashcard
19

Typing a Variable as a Function

Flashcard
20

Contextual Typing of Parameters

Flashcard
21

Arrow Function Syntax

Flashcard
22

Rest Parameters

Flashcard
23

Function Expression Syntax

Flashcard
24

Callback Function Types

Flashcard
25

Return Type Inference

Flashcard
Code QuizBeginner

Contextual Typing of Callback Parameters

An explicit callback parameter type overrides the correct contextually inferred type.

Codetypescript
const nums = [1, 2, 3];

nums.forEach((n: string) => {
  console.log(n.toFixed(2));
});

What is the bug in this callback?