JavaScript Basics: Values 3. Undefined vs Null

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JavaScript Basics: Values 3. Undefined vs Null

Undefined and null are two "nonvalues" that indicate missing information. Undefined represents uninitialized variables, missing parameters, nonexistent properties, and implicitly undefined return.

Null is an explicit representation of an empty value assign to a variable. Means "no object".

Previous episodes:
JavaScript Basics: Values 1. Static vs Dynamic Typing
JavaScript Basics: Values 2. Primitive vs Wrapper Objects
  1. JIMMY Online
  2. javascript
  3. undefined
  4. null
  5. empty values
  6. values
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