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* Our main function has simplied a lot
function changeCase(word, caseType) {
// We create a map of caseType -> function
const caseMap = {
"lower": convertToLower,
"camel": convertToCamel
// Look up the caseType "lower", "camel"
// The map will return its function, call it
caseType = caseType.trim().toLowerCase();
var conversionFunction = caseMap[caseType];
// Do we have this conversion function?
if ( conversionFunction != null )
return conversionFunction(word);
return null;
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