typescript check if key exists code example

Example 1: check if key exists in json typescript

if (cell.hasOwnProperty('Relationships')) {
	console.log("Key Found!!");
}
else {
	console.log("Not Found.");
}

Example 2: javascript hashtable contains key

if (obj.hasOwnProperty("key1")) {
  ...
}

Example 3: check if a key exists in an object javascript

"key" in obj // true, regardless of the actual value