4 ms·

var is not obsolete. You still need it sometimes for scoping reasons.

• int_19h 5y ago
  Could you give an example? It seems like any "var" could be replaced with "let" at a different scope.
  • dheera 5y ago
    Won't work: if(checkForSomething()) { let foo = 2; } else { let foo = 3; } console.log(foo); // won't work But: if(checkForSomething()) { var foo = 2; } else { var foo = 3; } console.log(foo); // will work That said, I religiously avoid "var" and just declare the variable beforehand with "let" because there are too many other gotchas with var. Less debugging headaches. And use "const" religiously as well, like C++ people do.
    • speedgoose 5y ago
      const in C++ is very different than const in JavaScript though. I guess you are well aware of that but I feel like being pedantic. This is allowed in JavaScript: const foo = {bar: 1}; foo.bar = 2;
      • int_19h 5y ago
        It's not really any different if you keep in mind that foo is a reference here, and so that's what const applies to. The equivalent in C++ would be a const pointer to a non-const object.
      • zeven7 5y ago
        const foo = Object.freeze({bar: 1});
    • int_19h 5y ago
      That's exactly what I meant by "any "var" could be replaced with "let" at a different scope": let foo; if (checkForSomething()) { foo = 2; } else { foo = 3; }
• zeven7 5y ago
  You don't need var, you don't need it's weird scoping behavior.