C syntax was never that great. It's basically mnemonic PDP-11 assembler with a few added data structures.

js is mutant C with dementia - hacked together over over a fortnight, full of inconsistencies and weird corners.

    console.log(1 + "2"); // "12"
    console.log(1 - "2"); // -1
    console.log(NaN === NaN); // false
    console.log(+0 === -0); // true

    const obj = {};
    console.log(obj.foo); // undefined, not an error

NaN is a standardized dynamic languages datatype governed by IEEE 754, this is not something to complain about as its behavior is part of the official standard and for good reason, as outlined in the standard.

None of those examples are showing something you find wrong with the syntax

[dead]