Scope Chain & Lexical Scoping in JavaScript in Hindi | Advanced JavaScript in Hindi #8

Welcome, The scope chain is used to resolve the value of variable names in javascript. Without a scope chain, the Javascript engine wouldn't know which value to pick for a certain variable name if there are multiply defined at different scopes. The scope chain in javascript is lexically defined, which means that we can see what the scope chain will be by looking at the code.

At the top of the scope, the chain is the global scope, which is the window object in the browser (global in NodeJS). Besides from the global scope, functions have their own scoping of variables. The scope chain can be determined by looking at where functions are defined.

When resolving a variable, inner functions first look at their own scope. If the variable cannot be found in its own scope it will climb up the scope chain and looks for the variable name in the environment where the function was defined.

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