Pattern Overloading

Pattern Overloading by Ramsey Nasser.

From the post:

C-like languages have a problem of overloaded syntax that I noticed while teaching high school students. Consider the following snippets in such a language:


function foo(int x) {

for(int i=0;i < 10; i++) {

if(x > 10) {

case(x) {

A programmer experienced with this family would see

  1. Function invocation
  2. Function definition
  3. Control flow examples

In my experience, new programmers see these constructs as instances of the same idea: name(some-stuff) more-stuff. This is not an unreasonable conclusion to reach. The syntax for each construct is shockingly similar given that their semantics are wildly different.

You won’t be called upon to re-design C but Nasser’s advice:

Syntactic similarity should mirror semantic similarity

Or, to take a quote from the UX world

Similar things should look similar and dissimilar things should look dissimilar

is equally applicable to any syntax that you design.

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