The o in alert(isInLetterStack("o")); below may be replaced with any lowercase letter from a to j in the name of having an alert when comes back with true. Otherwise the alert will come back with false.
<html>
<head>
<script type="text/javascript">
var letterStack = {
"b":"a",
"c":"b",
"d":"c",
"e":"d",
"f":"e",
"g":"f",
"h":"g",
"i":"h",
"j":"i",
"k":"j"
}
alert(isInLetterStack("o"));
function isInLetterStack(target) {
return inLetterStack("k");
function inLetterStack(currentTarget) {
if(!letterStack[currentTarget]) {
return false;
}
if(letterStack[currentTarget] == target) {
return true;
}
return inLetterStack(letterStack[currentTarget])
}
}
</script>
</head>
<body />
</html>
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