PHP 8.5.8で確認。
<?php
$arr1 = array('1', '2');
# ARR1 1, 2
echo "ARR1 {$arr1[0]}, {$arr1[1]}\n";
$arr2 = $arr1;
$arr2[0] = '3';
# ARR2 1, 2
echo "ARR2 {$arr1[0]}, {$arr1[1]}\n";
# ARR3 3, 2
echo "ARR3 {$arr2[0]}, {$arr2[1]}\n";
$hash1 = array(
'hoge' => 'a',
'fuga' => 'b'
);
# HASH1 a, b
echo "HASH1 {$hash1['hoge']}, {$hash1['fuga']}\n";
$hash2 = $hash1;
$hash2['hoge'] = 'z';
# HASH2 a, b
echo "HASH2 {$hash1['hoge']}, {$hash1['fuga']}\n";
# HASH3 z, b
echo "HASH3 {$hash2['hoge']}, {$hash2['fuga']}\n";
$cls1 = new stdClass();
$cls1->hoge = 'A';
$cls1->fuga = 'B';
# CLS1 A, B
echo "CLS1 {$cls1->hoge}, {$cls1->fuga}\n";
$cls2 = $cls1;
$cls2->hoge = 'Q';
# CLS2 Q, B
echo "CLS2 {$cls1->hoge}, {$cls1->fuga}\n";
# CLS3 Q, B
echo "CLS3 {$cls2->hoge}, {$cls2->fuga}\n";
# ARR1 1, 2
# ARR2 1, 2
# ARR3 3, 2
# HASH1 a, b
# HASH2 a, b
# HASH3 z, b
# CLS1 A, B
# CLS2 Q, B
# CLS3 Q, B
Perl v5.38.2で確認。
use strict;
use warnings;
my @arr1 = ('1', '2');
# ARR1 1, 2
print "ARR1 $arr1[0], $arr1[1]\n";
my @arr2 = @arr1;
$arr2[0] = '3';
# ARR2 1, 2
print "ARR2 $arr1[0], $arr1[1]\n";
# ARR3 3, 2
print "ARR3 $arr2[0], $arr2[1]\n";
my %hash1 = (
'hoge' => 'a',
'fuga' => 'b'
);
# HASH1 a, b
print "HASH1 $hash1{'hoge'}, $hash1{'fuga'}\n";
my %hash2 = %hash1;
$hash2{'hoge'} = 'z';
# HASH2 a, b
print "HASH2 $hash1{'hoge'}, $hash1{'fuga'}\n";
# HASH3 z, b
print "HASH3 $hash2{'hoge'}, $hash2{'fuga'}\n";
my $cls1 = bless {
hoge => 'A',
fuga => 'B'
}, 'StdClass';
$cls1->{'hoge'} = 'A';
$cls1->{'fuga'} = 'B';
# CLS1 A, B
print "CLS1 $cls1->{hoge}, $cls1->{fuga}\n";
my $cls2 = $cls1;
$cls2->{'hoge'} = 'Q';
# CLS2 Q, B
print "CLS2 $cls1->{hoge}, $cls1->{fuga}\n";
# CLS3 Q, B
print "CLS3 $cls2->{hoge}, $cls2->{fuga}\n";
# ARR1 1, 2
# ARR2 1, 2
# ARR3 3, 2
# HASH1 a, b
# HASH2 a, b
# HASH3 z, b
# CLS1 A, B
# CLS2 Q, B
# CLS3 Q, B
Ruby 4.0.5で確認。
arr1 = ['1', '2']
# ARR1 1, 2
puts "ARR1 #{arr1[0]}, #{arr1[1]}"
arr2 = arr1
arr2[0] = '3'
# ARR2 3, 2
puts "ARR2 #{arr1[0]}, #{arr1[1]}"
# ARR3 3, 2
puts "ARR3 #{arr2[0]}, #{arr2[1]}"
hash1 = {
'hoge' => 'a',
'fuga' => 'b'
}
# HASH1 a, b
puts "HASH1 #{hash1['hoge']}, #{hash1['fuga']}"
hash2 = hash1
hash2['hoge'] = 'z'
# HASH2 z, b
puts "HASH2 #{hash1['hoge']}, #{hash1['fuga']}"
# HASH3 z, b
puts "HASH3 #{hash2['hoge']}, #{hash2['fuga']}"
class HogeCls
attr_accessor :hoge, :fuga
def initialize(_hoge, _fuga)
@hoge = _hoge
@fuga = _fuga
end
end
cls1 = HogeCls.new('A', 'B')
# CLS1 A, B
puts "CLS1 #{cls1.hoge}, #{cls1.fuga}"
cls2 = cls1
cls2.hoge = 'Q'
# CLS2 Q, B
puts "CLS2 #{cls1.hoge}, #{cls1.fuga}"
# CLS3 Q, B
puts "CLS3 #{cls2.hoge}, #{cls2.fuga}"
# ARR1 1, 2
# ARR2 3, 2
# ARR3 3, 2
# HASH1 a, b
# HASH2 z, b
# HASH3 z, b
# CLS1 A, B
# CLS2 Q, B
# CLS3 Q, B
Python 3.12.0で確認。
arr1 = ['1', '2']
# ARR1 1, 2
print(f"ARR1 {arr1[0]}, {arr1[1]}")
arr2 = arr1
arr2[0] = '3'
# ARR2 3, 2
print(f"ARR2 {arr1[0]}, {arr1[1]}")
# ARR3 3, 2
print(f"ARR3 {arr2[0]}, {arr2[1]}")
hash1 = {
'hoge': 'a',
'fuga': 'b'
}
# HASH1 a, b
print(f"HASH1 {hash1['hoge']}, {hash1['fuga']}")
hash2 = hash1
hash2['hoge'] = 'z'
# HASH2 z, b
print(f"HASH2 {hash1['hoge']}, {hash1['fuga']}")
# HASH3 z, b
print(f"HASH3 {hash2['hoge']}, {hash2['fuga']}")
class HogeCls:
def __init__(self, _hoge, _fuga):
self.hoge = _hoge
self.fuga = _fuga
cls1 = HogeCls('A', 'B')
# CLS1 A, B
print(f"CLS1 {cls1.hoge}, {cls1.fuga}")
cls2 = cls1
cls2.hoge = 'Q'
# CLS2 Q, B
print(f"CLS2 {cls1.hoge}, {cls1.fuga}")
# CLS3 Q, B
print(f"CLS3 {cls2.hoge}, {cls2.fuga}")
# ARR1 1, 2
# ARR2 3, 2
# ARR3 3, 2
# HASH1 a, b
# HASH2 z, b
# HASH3 z, b
# CLS1 A, B
# CLS2 Q, B
# CLS3 Q, B
Node.js v24.16.0、Microsoft Edge 150.0.4078.105で確認。
const arr1 = ['1', '2'];
// ARR1 1, 2
console.log(`ARR1 ${arr1[0]}, ${arr1[1]}`);
const arr2 = arr1;
arr2[0] = '3';
// ARR2 3, 2
console.log(`ARR2 ${arr1[0]}, ${arr1[1]}`);
// ARR3 3, 2
console.log(`ARR3 ${arr2[0]}, ${arr2[1]}`);
const hash1 = {
hoge: 'a',
fuga: 'b'
};
// HASH1 a, b
console.log(`HASH1 ${hash1['hoge']}, ${hash1['fuga']}`);
const hash2 = hash1;
hash2['hoge'] = 'z';
// HASH2 z, b
console.log(`HASH2 ${hash1['hoge']}, ${hash1['fuga']}`);
// HASH3 z, b
console.log(`HASH3 ${hash2['hoge']}, ${hash2['fuga']}`);
class HogeCls {
constructor(_hoge, _fuga) {
this.hoge = _hoge
this.fuga = _fuga
}
}
const cls1 = new HogeCls('A', 'B');
// CLS1 A, B
console.log(`CLS1 ${cls1.hoge}, ${cls1.fuga}`);
const cls2 = cls1;
cls2.hoge = 'Q';
// CLS2 Q, B
console.log(`CLS2 ${cls1.hoge}, ${cls1.fuga}`);
// CLS3 Q, B
console.log(`CLS3 ${cls2.hoge}, ${cls2.fuga}`);
// ARR1 1, 2
// ARR2 3, 2
// ARR3 3, 2
// HASH1 a, b
// HASH2 z, b
// HASH3 z, b
// CLS1 A, B
// CLS2 Q, B
// CLS3 Q, B
バージョンの基準が謎だが、Visual Studio 2022の標準的な環境で確認した。
var arr1 = new[] { "1", "2" };
// ARR1 1, 2
Console.WriteLine($"ARR1 {arr1[0]}, {arr1[1]}");
var arr2 = arr1;
arr2[0] = "3";
// ARR2 3, 2
Console.WriteLine($"ARR2 {arr1[0]}, {arr1[1]}");
// ARR3 3, 2
Console.WriteLine($"ARR3 {arr2[0]}, {arr2[1]}");
var hash1 = new Dictionary<string, string> {
["hoge"] = "a",
["fuga"] = "b"
};
// HASH1 a, b
Console.WriteLine($"HASH1 {hash1["hoge"]}, {hash1["fuga"]}");
var hash2 = hash1;
hash2["hoge"] = "z";
// HASH2 z, b
Console.WriteLine($"HASH2 {hash1["hoge"]}, {hash1["fuga"]}");
// HASH3 z, b
Console.WriteLine($"HASH3 {hash2["hoge"]}, {hash2["fuga"]}");
var cls1 = new HogeCls("A", "B");
// CLS1 A, B
Console.WriteLine($"CLS1 {cls1.Hoge}, {cls1.Fuga}");
var cls2 = cls1;
cls2.Hoge = "Q";
// CLS2 Q, B
Console.WriteLine($"CLS2 {cls1.Hoge}, {cls1.Fuga}");
// CLS3 Q, B
Console.WriteLine($"CLS3 {cls2.Hoge}, {cls2.Fuga}");
class HogeCls {
public string Hoge { get; set; }
public string Fuga { get; set; }
public HogeCls(string hoge, string fuga) {
this.Hoge = hoge;
this.Fuga = fuga;
}
}
// ARR1 1, 2
// ARR2 3, 2
// ARR3 3, 2
// HASH1 a, b
// HASH2 z, b
// HASH3 z, b
// CLS1 A, B
// CLS2 Q, B
// CLS3 Q, B
