TYPESCRIPT

typescript array

// let arr_name, elemType[];
let list: number[] = [1, 2, 3];
// Generic array type, Array<elemType>:
let list: Array<number> = [1, 2, 3];

type check array typescript

if (Array.isArray(value)) {
   var somethingIsNotString = false;
   value.forEach(function(item){
      if(typeof item !== 'string'){
         somethingIsNotString = true;
      }
   })
   if(!somethingIsNotString && value.length > 0){
      console.log('string[]!');
   }
}

get type of element of array typescript

const animals = ['cat', 'dog', 'mouse'] as const
type Animal = typeof animals[number]

// type Animal = 'cat' | 'dog' | 'mouse'

typescript array

let list: number[] = [1, 2, 3];