⏱ 0:01est. 3 min

Var Let Const Block Scope Shadowing

// https://www.youtube.com/watch?v=BNC6slYCj50&list=PLlasXeu85E9cQ32gLCvAvr9vNaUccPVNP&index=9&ab_channel=AkshaySaini
// https://www.youtube.com/watch?v=lW_erSjyMeM&feature=emb_logo&ab_channel=AkshaySaini
var a = 100;
let b = 200;
const c = 300;
{
    var a = 1; // a is shadowing 'a' in line 1 (both 'a' are pointing to same memory location) // GLOBAL memory
    let b = 2; // block memory
    const c = 3; // block memory

    console.log(a); // 1 
    console.log(b); // 2 // shadowing because of block memory
    console.log(c); // 3 //
}

console.log(a); // 1 shadowed and modified line 1, both 'a' are pointing to same memory location)
console.log(b); // 200 // Not shadowing because of block memory, diff memory space
console.log(c); // 300 // Not shadowing because of block memory, diff memory space