substr.abra

// String Functions
func substr(input: String, start: Int, count: Int) {
  var substr = ""
  for i in range(0, input.length) {
    if(i >= start && i <= start + count - 1 ) {
      substr = substr + input[i]
    }
    
  }
  
  substr
}

// Assertion Library
func assert(message: String, expected: String, actual: String, verbose: Bool) {
  if(expected != actual) {
    println("FAILED: " + message)
    println("> Expected: " + expected)
    println("> Actual:   " + actual)
    
    false
  }
  else if(verbose) {
    println("PASS: " + message)
    println("> Expected: " + expected)
    println("> Actual:   " + actual)
    
    true
  }
  
  
  true
  
}


// Unit Tests
// substr("hello world", 4, 4) == "o wo"
assert("substr - hello world - 4, 4", 
  "o wo", 
  substr("hello world", 4, 4), 
  true
)

kengorab/abra-lang@333c9b4