nonsense.ts

[] + []; // JavaScript will give you "" (which makes little sense), TypeScript will error

//
// other things that are nonsensical in JavaScript 
// - don't give a runtime error (making debugging hard)
// - but TypeScript will give a compile time error (making debugging unnecessary)
//
{} + []; // JS : 0, TS Error
[] + {}; // JS : "[object Object]", TS Error  
{} + {}; // JS : NaN, TS Error
"hello" - 1; // JS : NaN, TS Error