Created
May 20, 2015 00:07
-
-
Save theho/79f1c1f94f0dba5aaaa2 to your computer and use it in GitHub Desktop.
Methon chaining inspired by $q / Q in Javascript
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# Inspired by $q/Q in javascript to chain methods | |
class Q: | |
def __init__(self, d): | |
self.d = d | |
self.error = None | |
def then(self, fn): | |
if not self.error: | |
try: | |
self.d = fn(self.d) | |
except Exception as e: | |
self.error = e | |
return self | |
def catch(self, fn): | |
if self.error: | |
fn(self.error) | |
return self | |
def done(self): | |
return self.d | |
if __name__=='__main__': | |
input = 123 | |
def add(d): | |
d+=999 | |
return d | |
def insert(d): | |
d+=102 | |
raise Exception('hello') | |
return d | |
def abc(e): | |
print ('error', e) | |
print(Q(input).then(add).then(insert).catch(abc).then(add).done()) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment