GeeCON 2016; Krakow, Poland; 13 May 2016

1. /10@yegor256 1
Fail Fast.
Into User’s Face.
Yegor Bugayenko

2. /10@yegor256 2
be arrogant

3. /10@yegor256 3
int len(File f) {
if (f == null) {
return -1;
}
}
int len(File f) {
if (f == null) {
throw new Exception(
“file can’t be NULL”
);
}
}

4. /10@yegor256 4
try {
stream.read();
} catch (IOException ex) {
ex.printStackTrace();
}
try {
stream.read();
} catch (IOException ex) {
throw new RuntimeException(
“failed to read stream”,
ex
);
}

5. /10@yegor256 5
void push(int x) {
if (pos < array.length) {
array[pos++] = x;
}
}
void push(int x) {
if (pos >= array.length) {
throw new Exception(
“array is full”
);
}
array[pos++] = x;
}

6. /10@yegor256 6
@Override
void save() {
// not implemented yet
}
@Override
void save() {
throw new Exception(
“not implemented yet”
);
}

7. /10@yegor256 7
file.delete();
if (!file.delete()) {
throw new Exception(
“failed to delete file”
);
}

8. /10@yegor256 8
User find(int id) {
if (/* not found */) {
return null;
}
// continue...
}
User find(int id) {
if (/* not found */) {
throw new Exception(
“user not found”
);
}
// continue...
}

9. /10@yegor256 9
fix
report
use
deploy

10. /10@yegor256 10
www.yegor256.com