• Re-use the code
• No need of re-writing on each webpage
• Code only has to be tested once for errors
• File/JavaScript is cached by web browser
• ...reduces network access time
• JavaScript code embedded in webpages can slow loading times
• ...webpage can slow while browser executes code
• Can separate code into different conceptual areas
• ...provides modularity to code
• ...separate html and JavaScript code so easier to read/maintain.
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