Yield (instruction)
- Yield (instruction)
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Pour les articles homonymes, voir
Yield.
Le yield est une instruction de programmation qui sert à imposer la constructivité d'une fonction. Elle est plus souvent présente dans les langages à haut niveau comme Python, Ruby ou le C#. Son utilisation dans une fonction permet de retourner un générateur. Dans le cas du python, appeler la méthode next() de ce générateur exécutera la fonction et retournera une valeur. Le yield procède comme un return au détail près que cette fonction est liée a un générateur et que le prochain appel de la méthode next() reprendra l'exécution là où elle en était.
Exemple en language Python
def fonction(x):
print('début fonction')
while 1:
yield x
print('incrémente x')
x = x + 1
gen = fonction(2)
gen.next()
# début fonction
# 2
gen.next()
# incrémente x
# 3
Exemple en language Ruby
En Ruby, l'opérateur yield va entrainer l'exécution du bloc de code passé en paramètre :
def delimit
puts "before yield"
yield if block_given?
puts "after yield"
end
delimit{ puts "in yield" } #=> "before yield\n" "in yield\n" "after yield\n"
Lien externe
- (en) yield sur la documentation de python.org
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