[TypeScript] TypeScript Grammar - 02

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[TypeScript] TypeScript Grammar - 01

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2.  Array

In this section, we are going to find out what's typescript's array types are

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2_01.  Array_number

let numArray1: number[] = [1, 2, 3, 4, 5, 7, 12, 13];
let numArray2: Array<number> = [1, 2, 3]

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2_02.  Array_string

let apple: string[] = ['apple', 'macbook', 'iphone']
let apple2: Array<string> = ['apple logo', 'macbook air', 'iphone X']

In Java, you can't use integers as float. But in Typescript, we can use them equally

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2_03.  Array_multiple

let arr: (string | number)[] = ['Apple', 1, 2, 'Strawberry', 5]
let arr1: Array<string | number> = ['Apple', 1, 2, 'Strawberry', 5]

 

You can grammarly understand this as "You can fill this list with A and B"

For example, we can call the list filled with strings and numbers.

Therefore, it can be more flexible

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2_04.  Array_any

 

let whatArr: any[] = [1, 3, {}, [], 'hello', true]

Letterly any type can be used in this case

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End

 

 

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[TypeScript] TypeScript Grammar - 03~05