**Vaporeon** @vaporeon_@glaceon.social · Aug 04, 2025, 03:16

**Vaporeon** @vaporeon_@glaceon.social · Aug 04, 2025, 03:16

I forgot, what is difference between var and let in JavaScript? Something something scoping rules, but I forgot (or never knew?) the details...

**æʃliŋ, purrepurrocessor** @aescling@cat.family · 2025-08-04T03:18:10Z

æʃliŋ, purrepurrocessor @aescling@cat.family

@vaporeon_ let uses lexical scope. var ignores most blocks aside from function boundaries, and also hoists

**æʃliŋ, purrepurrocessor** @aescling@cat.family · Aug 04, 2025, 03:23

**æʃliŋ, purrepurrocessor** @aescling@cat.family · Aug 04, 2025, 03:23

æʃliŋ, purrepurrocessor @aescling@cat.family

// i is in scope HERE!!
for (var i = 0; i < 10; i++) {
    // ...
}
// i is still in scope!