Notes on software and the ideas behind it

Find the meaning
behind the code.

I’m Fred Yang. I write about software—how it works, why it behaves the way it does, and the ideas that make code easier to reason about.

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Working notes / 2026

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Architecture, reactivity, and the hidden relationships that shape frontend systems.

javascript

"this" in javascript

If you don't know javascript is a functional language and you do lots of object oriented programming, the follow code must be very confusing for you. var name = "Jerry";
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F#

mutable binding and ref type

We all know that in F#, once you bind a value to an identifier, that the value can not be changed. What does this means? It means the your identifier will be like a...
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F#

How Binding in f# is like in CLR

In c# or clr philosophy, everything is object, object is the horsepower. In f# philosophy, everything is value, function is the horsepower. However f# is implemented in CLR, I am just curious how F#...
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F#

Pattern matching shorthand in function definition

Pattern matching is powerful construct in F#, but sometime it is confusing to beginner, below is pattern matching shorthand in function definition. The paramter is implied in the matching pattern, essentially you can rewrite...
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jquery

benchmark you javascript

Here is script that is used to benchmark jQuery. // Runs a function many times without the function call overhead function benchmark(fn, times, name){ fn = fn.toString(); var s = fn.indexOf('{')+1, e = fn.lastIndexOf('}');...
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