May i ask, why this user-made implementations slower than built-in ones:
Sample:
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Fundamentals of Mathematical Statistics
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Computer Fundamentals and Computing Software
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Lab based on "Computer Fundamentals and Computing Software"
BSc 16 105
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Custom implementation, using Uint8List, and for loop to split the list of byte sequences:
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
final Uint8List bytes = File("/tmp/sample.txt").readAsBytesSync();
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
List<List<int>> separated = List<List<int>>.empty(growable: true);
separated.add(List<int>.empty(growable: true));
for(int i = 0; i< bytes.length;i++){
if(bytes[i] == 10){
separated.add(List<int>.empty(growable: true));
}else{
separated.last.add(bytes[i]);
}
}
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
List<String> stringed = List<String>.empty(growable: true);
for(int j= 0; j< separated.length;j++){
stringed.add(utf8.decode(separated[j]));
}
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
print('\n');
Slightly custom implementation, using Uint8List, then utf8.decode:
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
final Uint8List fileBytes = File("/tmp/sample.txt").readAsBytesSync();
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
final String coded = utf8.decode(fileBytes);
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
final List<String> codeSplit = coded.split('\n');
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
print('\n');
Using built-in implementations:
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
final String fileString = File("/tmp/sample.txt").readAsStringSync();
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
List<String> split = fileString.split('\n');
print(DateTime.now().minute.toString()+':'+DateTime.now().second.toString()+':'+DateTime.now().millisecond.toString()+':'+DateTime.now().microsecond.toString());
print('\n');
Results:
19:12:114:464
19:12:125:321
19:12:126:64
19:12:128:199
19:12:128:250
19:12:128:387
19:12:128:441
19:12:128:585
19:12:128:629
19:12:128:941
19:12:129:16
The same question was asked at the OFFICIAL git repository of dart, the primary focus of which is given below:
Different code behave differently.
The built-in functionality is written to be efficient at their job. The code here is not particularly efficient because it:
- Copies bytes into new arrays.
- Reads separated.last for each byte.
- Read bytes[i] twice.