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Last Updated : 07 Jan, 2020
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Hash#has_key?() is a Hash class method which checks whether the given key is present in hash.
Syntax: Hash.has_key?()
Parameter: Hash values
Return: true – if the key is present otherwise return false
Example #1 :
# Ruby code for Hash.has_key?() method
# declaring Hash value
a = {a:
100
, b:
200
}
# declaring Hash value
b = {a:
100
, c:
300
, b:
200
}
See AlsoHashes - Learn Perl - Free Interactive Perl TutorialHow to check if hash has key in RubyCS 2112/ENGRD 2112 Fall 2021Hashes | Ruby for Beginners# declaring Hash value
c = {a:
100
}
# has_key? Value
puts
"Hash a has_key? form : #{a.has_key?("
a
")}\n\n"
puts
"Hash b has_key? form : #{b.has_key?("
c
")}\n\n"
puts
"Hash c has_key? form : #{c.has_key?("
v
")}\n\n"
Output :
Hash a has_key? form : falseHash b has_key? form : falseHash c has_key? form : false
Example #2 :
# Ruby code for Hash.has_key?() method
# declaring Hash value
a = {
"a"
=>
100
,
"b"
=>
200
}
# declaring Hash value
b = {
"a"
=>
100
}
# declaring Hash value
c = {
"a"
=>
100
,
"c"
=>
300
,
"b"
=>
200
}
# has_key? Value
puts
"Hash a has_key? form : #{a.has_key?("
a
")}\n\n"
puts
"Hash b has_key? form : #{b.has_key?("
c
")}\n\n"
puts
"Hash c has_key? form : #{c.has_key?("
v
")}\n\n"
Output :
Hash a has_key? form : trueHash b has_key? form : falseHash c has_key? form : false
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