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Hoisting

Nov 01, 20241 min read

Hoisting means - moving the declaration to the top. Three types of hoisting are there :

1. Value hoisting

  • Can use the variable in its scope before the line its declared.
  • ==function, function, async function, async function==**

2. Declaration hoisting

  • Only the declaration is hoisted, means it can be accessed before the declaration line and will not give ReferrenceError , but the value is always Undefined.
  • var

3. No Hoisting

  • OR Technically Hoisted but will give ReferrenceError if accessed before its declaration, So it can be simply called No Hoisting
  • The zone until variable can’t be accessed is called the Temporal Dead Zone - TDZ
  • let, const, functions expressions

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