Fail Fast. Into User's Face.
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The document provides examples of how to make code more robust by replacing exceptions with explicit checks and failures. It shows how to change code from silently ignoring or swallowing errors to explicitly failing fast by throwing exceptions for invalid states and error conditions. This helps make issues visible to users and makes code behavior more predictable and problems harder to ignore.
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![/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;
}](https://image.slidesharecdn.com/2016-05-geecon-160515212514/85/Fail-Fast-Into-User-s-Face-5-320.jpg)
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Fail Fast. Into User's Face.
- 1. /10@yegor256 1 Fail Fast. Into User’s Face. Yegor Bugayenko
- 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... }