mobile typing isn't scored — practice only
public final class Config {
Java · general · type the snippet below to practice
def fib(n):
a, b = 0, 1
for _ in range(n):
a, b = b, a + b
return a
about this snippet
This is the singleton snippet in Java — 13 lines of real Java code that exercises common patterns you'll see in production. DeveloperType scores you on net WPM and accuracy and only counts runs above 95% accuracy on the leaderboard, so practice rewards precision, not speed alone.
view source (13 lines)
public final class Config {
private static volatile Config instance;
private Config() {}
public static Config get() {
if (instance == null) {
synchronized (Config.class) {
if (instance == null) instance = new Config();
}
}
return instance;
}
}
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