yield yana kiran block da aka bayar wa method — yana canja iko ga block, sai dai yana aika da kiyaye ga shi, sannan yana sake dawo method. Shi ne yadda hanyoyi suka kira blocks da aka bayar musu, kuma injin da ke bayan Ruby's iteration da yawa daidai patterns.
puts
puts
greet { puts }
Lokacin da method ya kira yield, yana aiwatar da block da aka bayar musu (a cikin { } ko do...end). Method yana sarrafa lokacin (kuma nawa jiya) block yana aiwatar.
def each_pair
yield("a", 1) # pass values to the block's parameters
yield("b", 2)
end
each_pair { |key, value| puts "#{key}: #{value}" }
# Output: a: 1 / b: 2
yield(args) yana aika da ƙiyaye ga alamun block (|key, value|) — shi ne yadda iteration methods suke ba da kowane element ga block.
def my_each(array)
i = 0
while i < array.length
yield(array[i]) # yield each element to the block
i += 1
end
end
my_each([1, 2, 3]) { |n| puts n * 2 } # 2, 4, 6
# this is essentially how Array#each works internally!
Wannan yana nuna yadda Ruby's iteration methods (each, map, etc.) suke aiwatarwa a gida — suna yield kowane element ga block.
def maybe_yield
if block_given? # check whether a block was passed (avoid an error)
yield
else
"no block"
end
end
# explicitly capture the block as a parameter (with &)
def run(&block) # &block captures the block as a Proc object
block.call # call it explicitly
end
block_given? yana bincika idan block ya kasance aka bayar shi (guje LocalJumpError), kuma &block yana kama block a matsayin Proc object da za ka iya adana ko aika.
Janyo yield yana da mahimmanci Ruby ilimi — injin shine da methods suke kira blocks, wanda shine gida na Ruby's signature iteration da yawa daidai patterns, don haka janyoyin shi yana haɗi yadda gefen Ruby ke aiwatarwa. yield yana kiran block da aka bayar wa method (canja iko ga shi, sai dai yana aika da kiyaye), wanda shine ainihin yadda Ruby's iteration methods (each, map, select) suke aiwatarwa a gida — suna yield kowane element ga block.
Janyon hakan yana bayar fushi ga Ruby's block-based iteration kuma yana ba da damar ka rubuta naka hanyoyi da suke karɓa blocks — iko mai ƙarfi don sarrafa expressive APIs, custom iterators, resource-management methods (setup/teardown a kewaye block), da DSLs.
Janyo yield (kiran block, aika da arguments ga shi), block_given? (safe checking aida block ya kasance aka bayar shi, guje errors), da &block (explicitly capture block a matsayin Proc) yana da mahimmanci duka ga janyo yadda Ruby's iteration da block-accepting methods suke aiwatarwa da kuma rubuta naka block-based methods.
Saida blocks suna da mahimmanci Ruby kuma yield shine yadda methods suke amfani da su, janyoyin yield yana zama zurfina da ƙarfafawa mu kan Ruby's most distinctive feature (blocks) kuma yana ba da damar ka rubuta nau'in daidai, block-accepting methods da ke sa Ruby expressive — iko mai daraja don sarrafa clean APIs kuma common interview topic da ke nuna janyoyin yadda Ruby's block mechanism ke aiwatarwa a gida.