Typo corrector

gistfile1.txt

function typoCorrector(sourceText, target, value) {
  // var matchPattern = target.match(/[A-Za-z]/g);
  var matchPattern = new RegExp(target, 'g');

  var matchCount = (sourceText.match(matchPattern) || []).length;

  console.log(
    "Replacing " + matchCount + " instances of " + target + " with " + value);
  return sourceText.replace(matchPattern, value);
}

// tests

function testTypoCorrector() {
  var sourceText = 'cats dogs cats dogs';
  var target = 'cats';
  var value = 'dogs';
  var expected = 'dogs dogs dogs dogs';
  if (typoCorrector(sourceText, target, value) === expected) {
    console.log('SUCCESS: `typoCorrector` is working');
  }
  else {
    console.log('FAILURE: `typoCorrector` is not working');
  }
}

testTypoCorrector();