Pattern matching pattern in javascript

patternMatching.js

// pattern matching is a nice mechanism supported by most functional languages (eg see scala examples: https://docs.scala-lang.org/tour/pattern-matching.html)
// here are some ways to use javascript switch and if statement for pattern matching
// we are using IIFE pattern to immediately invoke switch (or if) statement
const value1 = 1; 

// version using switch case
const value2 =  (_ => {
    switch (true) {
        case value1 === 1: return 'first case';
        case value1 === 2: return 'second case';
        case value1 === 3: return 'third case';
        default: return 'no match found';
    }
})()

// version using if else
const value3 =  (_ => {
      if ( value1 === 1) return 'first case';
      if ( value1 === 2) return 'second case';
      if ( value1 === 3) return 'third case!';   
      return 'no match found';
})()