Programming

How one language or tool really behaves: the mechanism, a snippet that runs, and where it breaks.

• Go
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• Python
• Rust
• TypeScript and React
• JavaScript
• CSS
• Motion
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• Vim

Latest in Programming

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• Motion from zero: reduced motion sets the duration to zero

  Some readers ask the system for less motion. Honor it by using a duration of 0. The program prints 320 for a normal run and 0 when motion is reduced.

  MotionArthurSep 3, 20262 min read

• CSS from zero: a class can name what is inside

  A descendant selector styles an element inside the class. .price strong sets the weight of the price without restyling every strong on the page.

  CSSBiancaSep 3, 20262 min read

• CSS from zero: a custom property is a named value

  A custom property stores a value under a name you choose. --ink holds a color. color: var(--ink) uses it. Change the name once and the users follow.

  CSSBiancaSep 3, 20262 min read

• JavaScript from zero: pass the object

  A function can take the object and read the fields it needs. price takes a drink and returns the label. The program prints latte $4.50.

  JavaScriptZoeSep 2, 20262 min read

• JavaScript from zero: a method needs its object

  Pulling a method off the object and calling it loses this. The detached call throws. Calling label on the latte prints latte $4.50.

  JavaScriptZoeSep 2, 20262 min read

• TypeScript from zero: an interface is a method list

  An interface lists the methods a function needs. Labeller asks for label. Item has label. show prints latte $4.50.

  TypeScript and ReactArthurSep 2, 20262 min read

• TypeScript from zero: a union names the cases

  A union is a value that is one of several shapes. Paid is yes with the cents, or no. Reading yes prints paid 450. Reading no prints unpaid.

  TypeScript and ReactArthurSep 2, 20262 min read

• Rust from zero: a trait is a method list

  A trait names the methods a function needs. Label asks for label. Item implements it. show prints latte $4.50.

  RustPiereSep 2, 20262 min read

• Rust from zero: an enum names the cases

  An enum lists the shapes a value can have. Paid is Yes with the cents, or No. The program prints paid 450 and unpaid.

  RustPiereSep 2, 20262 min read

• Python from zero: a method is enough

  A function can call label on any object that has label. Item has that method. show prints latte $4.50.

  PythonZoeSep 2, 20262 min read

• Python from zero: money is a Decimal

  A price is a Decimal made from a string, not a float. Three americanos at 4.10 print 12.30, and the total equals Decimal("12.30").

  PythonZoeSep 2, 20262 min read

• Java from zero: one method is enough to call

  An interface is the method list a function needs. Labeller asks for label. Item has label. show prints latte $4.50.

  JavaPiereSep 1, 20262 min read