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scope

Scope

function scope

block scope

global scope

local scope

variable access

scope hierarchy

child/parent scope

Introduction to JavaScript Function Scopes

Correctly access function result.

Correctly update global variable

Make use of function scope to return correct value.

Introduction to JavaScript Block Scope

Sum global and local variable

Correctly update global variable from within block

Shadow a variable inside an if block

Use const inside a for loop iteration

Introduction to JavaScript Nested Scopes

Read an outer variable from a nested function

Update an outer variable from a nested function