Tag: const
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const Type Parameters (TS 5.0) 5.0
TypeScript 5.0 const type parameters infer literal types instead of widened types — const T extends string[] infers ['a','b'] not string[].
2mo ago
typescript intermediate
Object.freeze / Object.seal ES5
Object.freeze() prevents all property changes (add/modify/delete), Object.seal() prevents add/delete but allows modification — both are shallow, not deep.
2mo ago
javascript intermediate
Hoisting — var, let, const and function ES5
JavaScript hoists declarations to the top of their scope — var and function declarations are fully hoisted, while let and const are hoisted but remain in the Temporal Dead Zone until their declaration line.
2mo ago
javascript intermediate
Temporal Dead Zone (TDZ) ES2015
let and const variables exist in a Temporal Dead Zone from the start of their block until their declaration — accessing them before throws ReferenceError.
2mo ago
javascript intermediate