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sachinkmohan/typescript-crash.ts

Forked from bradtraversy/typescript-crash.ts
Created July 6, 2024 16:35
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Revisions

  1. @bradtraversy bradtraversy revised this gist Aug 18, 2021. 1 changed file with 2 additions and 2 deletions.
    4 changes: 2 additions & 2 deletions typescript-crash.ts
    View file
    Original file line number Diff line number Diff line change
    @@ -10,7 +10,7 @@ let arr: any[] = [1, true, 'Hello']
    // Tuple
    let person: [number, string, boolean] = [1, 'Brad', true]
    // Tuple Array
    let employee: [number, string][]
    let employees: [number, string][]

    employee = [
    [1, 'Brad'],
    @@ -126,4 +126,4 @@ function getArray<T>(items: T[]): T[] {
    let numArray = getArray<number>([1, 2, 3, 4])
    let strArray = getArray<string>(['brad', 'John', 'Jill'])

    strArray.push(1)
    strArray.push(1) // Throws error
  2. @bradtraversy bradtraversy created this gist Aug 17, 2021.
    129 changes: 129 additions & 0 deletions typescript-crash.ts
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,129 @@
    // Basic Types
    let id: number = 5
    let company: string = 'Traversy Media'
    let isPublished: boolean = true
    let x: any = 'Hello'

    let ids: number[] = [1, 2, 3, 4, 5]
    let arr: any[] = [1, true, 'Hello']

    // Tuple
    let person: [number, string, boolean] = [1, 'Brad', true]
    // Tuple Array
    let employee: [number, string][]

    employee = [
    [1, 'Brad'],
    [2, 'John'],
    [3, 'Jill'],
    ]

    // Union
    let pid: string | number
    pid = '22'

    // Enum
    enum Direction1 {
    Up = 1,
    Down,
    Left,
    Right,
    }

    enum Direction2 {
    Up = 'Up',
    Down = 'Down',
    Left = 'Left',
    Right = 'Right',
    }

    // Objects
    type User = {
    id: number
    name: string
    }

    const user: User = {
    id: 1,
    name: 'John',
    }

    // Type Assertion
    let cid: any = 1
    // let customerId = <number>cid
    let customerId = cid as number

    // Functions
    function addNum(x: number, y: number): number {
    return x + y
    }

    // Void
    function log(message: string | number): void {
    console.log(message)
    }

    // Interfaces
    interface UserInterface {
    readonly id: number
    name: string
    age?: number
    }

    const user1: UserInterface = {
    id: 1,
    name: 'John',
    }

    interface MathFunc {
    (x: number, y: number): number
    }

    const add: MathFunc = (x: number, y: number): number => x + y
    const sub: MathFunc = (x: number, y: number): number => x - y

    interface PersonInterface {
    id: number
    name: string
    register(): string
    }

    // Classes
    class Person implements PersonInterface {
    id: number
    name: string

    constructor(id: number, name: string) {
    this.id = id
    this.name = name
    }

    register() {
    return `${this.name} is now registered`
    }
    }

    const brad = new Person(1, 'Brad Traversy')
    const mike = new Person(2, 'Mike Jordan')

    // Subclasses
    class Employee extends Person {
    position: string

    constructor(id: number, name: string, position: string) {
    super(id, name)
    this.position = position
    }
    }

    const emp = new Employee(3, 'Shawn', 'Developer')

    // Generics
    function getArray<T>(items: T[]): T[] {
    return new Array().concat(items)
    }

    let numArray = getArray<number>([1, 2, 3, 4])
    let strArray = getArray<string>(['brad', 'John', 'Jill'])

    strArray.push(1)