update new codes#5

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codeswithpankaj wants to merge 3 commits intoPankaj-Str:mainfrom

codeswithpankaj:main

Commits on Apr 12, 2025

Add String_Methods.js with examples of string manipulation methods in JavaScript
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Add Array_Methods.js with examples of array manipulation methods in JavaScript
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Commits on Jul 14, 2025

Add HTML and JavaScript files for basic function examples and billing system functionality
codeswithpankaj
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