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@StevenXL
Created June 14, 2015 21:43
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FreeCodeCamp Bonfire - Search and Replace
function replace(str, before, after) {
// make sure before and after are the same case
after = duplicateCase(before, after);
// use RegExp object with global setting on
var searchFor = new RegExp(before, 'g');
return str.replace(searchFor, after);
}
function duplicateCase(sourceWord, modifiableWord) {
// figure out the case of both words
var sourceCase = isUpperCase(sourceWord);
var modifiableCase = isUpperCase(modifiableWord);
// if they are the same case, then return the second argument
if (sourceCase === modifiableCase) {
return modifiableWord;
}
else if (sourceCase && !modifiableCase) {
// source is uppercase, modifiable is lower case
return upperCaseWord(modifiableWord);
}
else {
// source must be lower case and modifiable upper case
return lowerCaseWord(modifiableWord);
}
}
function isUpperCase(word) {
// return True if the first letter of the argument is upperCase
// false otherwise
if (word.charCodeAt(0) >= 65 && word.charCodeAt(0) <= 90) {
return true;
}
else {
return false;
}
}
function upperCaseWord(word) {
var upperCaseLetter = word[0].toUpperCase();
return upperCaseLetter + word.slice(1);
}
function lowerCaseWord(word) {
var lowerCaseLetter = word[0].toLowerCase();
return lowerCaseLetter + word.slice(1);
}
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