typescript object key code example

Example 1: typescriprt specify type of key

var stuff: { [key: string]: string; } = {};
stuff['a'] = ''; // ok
stuff['a'] = 4;  // error

// ... or, if you're using this a lot and don't want to type so much ...
interface StringMap { [key: string]: string; }
var stuff2: StringMap = { };
// same as above

Example 2: object keys javascript

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));
// expected output: Array ["a", "b", "c"]

Example 3: js object keys

var myObj = {no:'u',my:'sql'}
var keys = Object.keys(myObj);//returnes the array ['no','my'];

Example 4: object.keys javascript

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));