map Add in TypeScript

In TypeScript, you can add an element to a hash using the following syntax:

hashName[key] = value;

Where hashName is the name of your hash (or object), key is the name of the key you want to add, and value is the value you want to associate with that key. Here is an example:

let myHash = {
  name: 'John',
  age: 30,
  city: 'New York'
};
myHash['occupation'] = 'Teacher';
console.log(myHash);

In this example, we create a hash called myHash with three keys: name, age, and city. We then add a new key called occupation with the value 'Teacher'. When we log myHash to the console, we see that the new key has been added:

{ name: 'John', age: 30, city: 'New York', occupation: 'Teacher' }