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+<!DOCTYPE html>
+<html>
+ <head>
+ <meta charset="utf-8" />
+ <title>Cube Root Training</title>
+ </head>
+ <body>
+ <h1>Cube Root Training</h1>
+ <p id=cube></p>
+ <p><input type="text" id="cuberoot" value ="" size=3></p>
+ <p id=result></p>
+ <p id=stats></p>
+
+ <script>
+var cube = document.getElementById("cube");
+var cuberoot = document.getElementById("cuberoot");
+var result = document.getElementById("result");
+var stats = document.getElementById("stats");
+var began;
+var finished;
+var elapsed = 0;
+var generated;
+var guesses = 0;
+var correct = 0;
+
+cuberoot.addEventListener("keydown", function (e) {
+ if (e.keyCode === 13) {
+ check_cuberoot(e);
+ }
+})
+
+function humanize_ms(ms) {
+ if (ms < 1000) {
+ return ms + "ms";
+ } else {
+ return (Math.floor(ms / 100) / 10) + "s";
+ }
+}
+
+function start_round() {
+ if (guesses > 0) {
+ stats.innerHTML = "Got " + correct + " correct out of " + guesses +
+ ". Last round took " + humanize_ms(finished - began) +
+ "." + ((correct > 0)
+ ?" Average time of correct guess was " +
+ humanize_ms(elapsed / correct) + "."
+ :"");
+ }
+ generated = Math.floor(Math.random() * 90) + 10;
+ cube.innerHTML = Math.pow(generated, 3);
+ began = Date.now();
+ cuberoot.value = "";
+ cuberoot.focus();
+}
+
+function check_cuberoot(e) {
+ var guess = e.target.value;
+
+ guesses++;
+ finished = Date.now();
+ if (guess == generated) {
+ correct++;
+ elapsed += (finished - began);
+ result.innerHTML = "Correct!";
+ } else {
+ result.innerHTML = "Not correct! Correct answer was " + generated + ".";
+ }
+ start_round();
+}
+
+start_round();
+ </script>
+ </body>
+</html>