JavaScript is a weakly (loosely) typed language as opposed to Swift that is a strongly typed language.

In this example the type `name` is not strongly tied to forever be a `String`. Re-assigning the data type to be a `Number` does not cause a compile-time error like a language like Swift. This causes the developer to check types when working through various coding logic.

```javascript

let name = "Alex";

name = 10;

console.log(`${name + 7}`); // name here is a number

In this Swift example we would get a compile time error as we cannot re-assign the name data type to an `Int`.

```swift

var name = "Alex";

name = 10; // COMPILER ERROR - cannot assign type Int to expected type String

print("\(name + 7)") // name here is a number