@TypeScript

let isDown: boolean = true;

let age: number = 24;
let age: number = 0b11000;
let age: number = 0o28;
let age: number = 0x18;        

let name: string = 'cnplaman';
let name: string = "cnplaman";

let list: string[] = ['cnplaman', 'glpla'];
let list: Array[string] = ["cnplaman", "glpla"];
let gender=['male','female',1,0]

let x: [string, number];
y = ['cnplaman', 24];//ok
x = [24, 'cnplaman'];//fail

enume Color= {red, green, blue};
let c: Color = Color.red

let gender: string | number;
gender = 'male'
gender = 1

function fn(): void {
  console.log('hi, there.');
}

if(age > 18){
  console.log('adult');
}

if(age > 18){
  console.log('adult');
}else{
  console.log('teenager')
}

if(age > 18){
  console.log('adult');
}else if(age > 24){
  console.log('grownup')
}else{
  console.log('teenager')
}

switch(gender){
  'male':
    console.log('you are male');
    break;
  'female':
    console.log('you are female');
    break;
  default:
    console.log('not for sure');
    break;
}

function sum(x:number, y:number): number {
  return x + y;
}

let sum = function(x:number, y:number): number {
  return x + y;
}

let sum = (x:number, y:number) => x + y;

let gender=['male','female',1,0]
for(let item of gender){
    console.log(item)
}

let gender=['male','female',1,0]
for(let ind in gender){
    console.log(ind)
}
//"0","1","2","3"