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一覧.キーの一覧（keys）

Python​

py
dict1.keys()

Swift​

swift
dict1.keys

PHP​

php
array_keys($dict1)

Ruby​

rb
dict1.keys

PowerShell​

powershell
$dict1.Keys

C++​

cpp
for(map<int,int>::iterator it = m.begin(); it != m.end(); ++it) { keys.push_back(it->first); }
cpp
map<int, int> m;
vector<int> keys;
for(map<int,int>::iterator it = m.begin(); it != m.end(); ++it) {
    keys.push_back(it->first);
}