2.4 āĻā§āĻĒāĻ˛-āĻāĻ¨āĻžāĻŽ
āĻā§āĻĒāĻ˛ (Tuple)
āĻā§āĻĒāĻ˛ āĻāĻžāĻāĻĒāĻ¸ā§āĻā§āĻ°āĻŋāĻĒā§āĻā§ āĻāĻāĻāĻŋ āĻ¨āĻ¤ā§āĻ¨ āĻĄāĻžāĻāĻž āĻāĻžāĻāĻĒ, āĻ¯ā§āĻāĻž āĻāĻ¸āĻ˛ā§ āĻŦāĻŋāĻāĻŋāĻ¨ā§āĻ¨ āĻĄāĻžāĻāĻž āĻāĻžāĻāĻĒā§āĻ° āĻā§āĻ¯āĻžāĻ˛ā§ āĻ§āĻ°ā§ āĻ°āĻžāĻāĻ¤ā§ āĻĒāĻžāĻ°ā§, āĻ¤āĻŦā§ āĻāĻŋ āĻāĻŋ āĻāĻžāĻāĻĒā§āĻ° āĻĄāĻžāĻāĻž āĻ°āĻžāĻāĻŦā§ āĻ¸ā§āĻāĻž āĻāĻŽāĻžāĻĻā§āĻ° āĻŦāĻ˛ā§ āĻĻāĻŋāĻ¤ā§ āĻšāĻŦā§, āĻāĻāĻžāĻ° Syntax āĻĻā§āĻāĻ¤ā§ āĻ ā§āĻ¯āĻžāĻ°ā§āĻ° āĻŽāĻ¤ā§ āĨ¤
// other variable types
var empId: number = 1;
var empName: string = "Mahmudul Hasan";
// Tuple type variable
var employee: [number, string] = [1, "Mahmudul Hasan"];
āĻāĻŦāĻžāĻ° āĻ ā§āĻ¯āĻžāĻ°ā§ āĻāĻŦāĻ āĻ āĻŦāĻā§āĻā§āĻā§āĻ° āĻŽāĻ¤ā§, āĻā§āĻĒāĻ˛āĻā§ āĻāĻŽāĻ°āĻž āĻ¨āĻ¤ā§āĻ¨ āĻā§āĻ¯āĻžāĻ°āĻŋā§āĻžāĻŦāĻ˛ā§ destruct āĻāĻ°āĻ¤ā§ āĻĒāĻžāĻ°āĻŋ, āĻāĻ˛ā§āĻ¨ āĻāĻāĻāĻž āĻāĻĻāĻžāĻšāĻ°āĻŖ āĻĻā§āĻāĻž āĻ¯āĻžāĻāĨ¤
const profile : [string, number, string, boolean] = [
'Mahmudul Hasan',
28,
`Meherpur, Mujibnagar`,
true,
];
const [name, age, address, married] = profile;
console.log(`${name} is ${age} years old.`);
//output
Mahmudul Hasan is 28 years old
āĻāĻŦāĻžāĻ° āĻāĻŽāĻ°āĻž āĻāĻžāĻāĻ˛ā§ āĻā§āĻ¨ āĻĢāĻžāĻāĻļāĻ¨ā§āĻ° āĻ°āĻŋāĻāĻžāĻ°ā§āĻ¨ āĻāĻžāĻāĻĒ āĻšāĻŋāĻ¸āĻžāĻŦā§āĻ āĻā§āĻĒāĻ˛ āĻŦā§āĻ¯āĻžāĻŦāĻšāĻžāĻ° āĻāĻ°āĻ¤ā§ āĻĒāĻžāĻ°āĻŋāĨ¤
function ageDistance(age1: number, age2: number): [number, boolean] {
return age1 > age2 ? [age1 - age2, true] : [age2 - age1, false];
}
const [difference, isOlder] = ageDistance(30, 69);
console.log(difference); // Output: 39
console.log(isOlder); // Output: false
- numeric enums
- string-based enums
//Numeric enums
enum Direction {
Up = 1,
Down,
Left,
Right,
}
console.log(Direction.Right);
// output 4
āĻāĻāĻžāĻ¨ā§ āĻāĻŽāĻ°āĻž Up āĻā§ 1 āĻĻāĻŋā§ā§ āĻāĻ¨āĻŋāĻļāĻŋā§āĻžāĻ˛āĻžāĻāĻ āĻāĻ°ā§ āĻĻāĻŋā§ā§āĻāĻŋ āĻāĻŦāĻ āĻāĻāĻž āĻ¯ā§āĻšā§āĻ¤ā§ āĻ¨āĻŋāĻāĻŽā§āĻ°āĻŋāĻ āĻāĻ¨āĻžāĻŽ āĻ¤āĻžāĻ āĻŦāĻžāĻāĻŋ āĻŽā§āĻŽā§āĻŦāĻžāĻ°āĻā§āĻ˛ā§ āĻ āĻā§ āĻāĻ¨āĻā§āĻ°āĻŋāĻŽā§āĻ¨ā§āĻ āĻšā§ā§, Down =>  2, Left =>  3, āĻāĻŦāĻ Right => 4 āĻšāĻŦā§, āĻāĻŦāĻžāĻ° āĻāĻŽāĻ°āĻž āĻ¯āĻĻāĻŋ Up āĻā§ āĻāĻ¨āĻŋāĻļāĻŋā§āĻžāĻ˛āĻžāĻāĻ āĻ¨āĻž āĻāĻ°āĻ¤āĻžāĻŽ āĻ¤āĻžāĻšāĻ˛ā§ 0 āĻĻāĻŋā§ā§ āĻļā§āĻ°ā§ āĻšāĻ¤ā§āĨ¤
// error case
enum E {
A = getSomeValue(),
B,
//error Enum member must have initializer.
}
//string enum
enum Direction {
Up = "UP",
Down = "DOWN",
Left = "LEFT",
Right = "RIGHT",
}
console.log(Direction.Right);
//output RIGHT
āĻ¤āĻŦā§ āĻ¸ā§āĻā§āĻ°āĻŋāĻ āĻāĻ¨āĻžāĻŽ āĻāĻ° āĻā§āĻˇā§āĻ¤ā§āĻ°ā§ āĻ āĻŦāĻļā§āĻ¯āĻ āĻāĻŽāĻžāĻĻā§āĻ° āĻĒā§āĻ°āĻ¤āĻŋāĻāĻŋ āĻŽā§āĻŽā§āĻŦāĻžāĻ° āĻā§ āĻ¸ā§āĻā§āĻ°āĻŋāĻ āĻā§āĻ¯āĻžāĻ˛ā§ āĻĻāĻŋā§ā§ āĻāĻ¨āĻŋāĻļāĻŋā§āĻžāĻ˛āĻžāĻāĻ āĻāĻ°ā§ āĻĻāĻŋāĻ¤ā§ āĻšāĻŦā§āĨ¤
