let a = 10; { let a = 50; var b = 60; const c = 70; console.log(a) console.log(b); console.log(c); } console.log(a); What is the output of this code? #javascrip #blockscoping #shadowing #programming

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In a word: Blockscoping. The term perhaps you're asking about. But it's more than that! Let is just var but fortakes redeclareability. Const is just let but fortakes reassignability. Let & const both provide blockscoping while var is functionscoped or global.

#TypeScript `let` : #Temporal #DeadZone and #BlockScoping stackoverflow.com/a/37200310… #JavaScript #ES6 #ES2015 🌹