The foundation of modern JavaScript memory management.
Observe the syntax on the left.
A.D.A: Modern JavaScript uses 'let' and 'const' instead of 'var'. These keywords provide 'block scope', meaning they only exist inside the curly braces they are defined in.
Unlock logic nodes by mastering modern declarations.
JavaScript variables are containers for values. ES6 introduced let and const to fix issues with the old var keyword.
let age = 25; // Can change
const PI = 3.14; // Fixed
Successfully declared let and const variables.
Understand the fixed nature of const.
Mastered the difference between let, const, and var.
The old var keyword is "function scoped" and allows "hoisting," which often leads to bugs where variables are accessible before they are defined or leak out of if statements.