함수 keys()

다른 뜻에 대해서는 Redis KEYS 문서를 참조하십시오.
keys()
array_keys()

1 Go[ | ]

Go MapKeys() 문서를 참고하십시오.

Go

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package main

import (
	"fmt"
	"reflect"
)

func main() {
	m := map[string]int{
		"first":  1,
		"second": 4,
	}
	keys := reflect.ValueOf(m).MapKeys()
	fmt.Println(keys) // [first second]
}

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2 Java[ | ]

자바 HashMap.keySet() 문서를 참고하십시오.

Java

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HashMap<String,Object> hm = new HashMap<String,Object>();
hm.put("first", "1");
hm.put("second", "4");

System.out.println( hm.keySet().getClass() );
// class java.util.HashMap$KeySet
System.out.println( hm.keySet() );
// [first, second]

3 JavaScript[ | ]

JavaScript Object.keys() 문서를 참고하십시오.

JavaScript

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var member = { 'ID': '102', 'Name': 'YONEZAWA Akinori', 'Address': 'Naha, Okinawa' };
console.log(Object.keys(member));
// ["ID", "Name", "Address"]

4 PHP[ | ]

PHP array_keys() 문서를 참고하십시오.

PHP

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$member = [ 'ID'=>102, 'Name'=>'YONEZAWA Akinori', 'Address'=>'Naha, Okinawa' ];
$keys = array_keys($member);
print_r($keys);
# Array
# (
#     [0] => ID
#     [1] => Name
#     [2] => Address
# )

5 Python[ | ]

파이썬 keys() 문서를 참고하십시오.

파이썬 딕셔너리 키 추출하여 리스트로 만들기 문서를 참고하십시오.

Python

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member = { 'ID' : 102, 'Name' : 'YONEZAWA Akinori', 'Address' : 'Naha, Okinawa' }
print( member.keys() )
# dict_keys(['ID', 'Name', 'Address'])

Python

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member = { 'ID' : 102, 'Name' : 'YONEZAWA Akinori', 'Address' : 'Naha, Okinawa' }
print( list(member.keys()) )
# ['ID', 'Name', 'Address']

6 Perl[ | ]

(주의) 순서 바뀜

Perl

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my %month = (
	"January" => "1월",
	"February" => "2월",
	"March" => "3월",
	"April" => "4월",
	"May" => "5월",
	"June" => "6월",
	"July" => "7월",
	"August" => "8월",
	"September" => "9월",
	"October" => "10월",
	"November" => "11월",
	"December" => "12월"
);

foreach my $key (keys %month) {
	print "$key\n";
}
#November
#July
#June
#February
#April
#January
#August
#March
#September
#October
#May
#December

7 Ruby[ | ]

루비 .keys 문서를 참고하십시오.

Ruby

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options = { font_size: 10, font_family: "Arial" }
print options.keys
# [:font_size, :font_family]

Ruby

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require 'pp'
member = { "ID" => 102, "Name" => "YONEZAWA Akinori", "Address"=> "Naha, Okinawa" }
pp member.keys
# ["Address", "Name", "ID"]

8 같이 보기[ | ]