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JavaScript

Practical tutorials for the work we actually do. Pick one, read it in order, and apply it.

Any category Programming2 JavaScript 2
Any topics APIs and Integrations 2 Data Structures and Algorithms 1 Object-Oriented Programming 2 Packaging and Dependencies 3 Programming Basics 2 Testing and Debugging 5
Any level Beginner 8 Intermediate 2
JavaScript Programming Basics Intermediate Clear filters 2 results
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Why Your Date Is Off by One Day

Your date moves a day because one part of the code uses UTC and another uses local time. Find which step does it, keep calendar days as YYYY-MM-DD strings, and name the time zone when you format.

5 min read
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Destructuring Function Parameters With Defaults

Replace long lists of positional arguments with one options object, destructured in the parameter list with defaults. Add = {} so a call with no argument doesn't crash, and know that defaults only replace undefined.

4 min read