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redeclaration var and let
The var keyword allows us to redeclare a variable without any issue: 
var counter = 10;
var counter;
console.log(counter); // 10
However, if we redeclare a variable with the let keyword, we will get an error: 
let counter = 10;
let counter; // undefined
by Luka Tatarishvili
4 years ago
JavaScript
variables
1
Pro tip: use ```triple backticks around text``` to write in code fences