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DianeCho/Explaining Local and Global Scope

Created October 21, 2017 14:19
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Scopes in JS
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Explaining Local and Global Scope
What is scope? Your explanation should include the idea of global vs. local scope.
Scope: Two types- local or global. It determines the accessibility of variables, objects, and functions from different parts of the code.
Local Scope: Variables declared within the function. It can only be accessed within that function
Global Scope: A variable declared outside a function. All scripts and functions can access it.
Why are global variables avoided?
Because it can overwrite window variables or functions
Explain JavaScript's strict mode
When the value is undefined
What are side effects, and what is a pure function?
Pure function:
Given the same input, will always return the same output.
Produces no side effects.
Side effects:
Is any effect other than that return value
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