is there a difference between the following two square bracket notations in Typescript? Tried a couple of scenarios and it seems they are equivalent?
Thank you!
interface test { a: string; b: string; } const x: test[] = [{a: "aaaa", b: "bbbb"}] const y: [test] = [{a: "aaaa", b: "bbbb"}] 1 Answer
As @VLAZ pointd out, x is an Array, while y is a Tuple.
The difference is observable even in this simple case.
interface test { a: string; b: string; } const x: test[] = [{a: "aaaa", b: "bbbb"}] const y: [test] = [{a: "aaaa", b: "bbbb"}] x.push({a: "a1", b: "b1"}); // works fine y.push({a: "a1", b: "b1"}); // works fine const a = x[1]; // works fine const b = y[1]; // compilation error // Tuple type '[test]' of length '1' has no element at index '1'. 
