色んな言語のfor foreach

for.md

JavaScript

// indexのみ
for (index in a) {
  console.log(a[index]);
}

// 中身のみ
for (i of a) {
  console.log(i);
}
a.forEach((x) => {console.log(x)});

a.forEach((x, index) => {console.log(x)});

Python

for name in arr:
    print(name)
    
for index, name in enumerate(arr):
    print(index)

ruby

for fruit in fruits do  
  p fruit 
end

for key, value in score do
  p key, value
end

strs.each do |str|
  puts str
end

a.each_with_index do |x, i|
  puts "#{i}: #{x}"
end

php

for ($i = 0; $i < 10; $i++) {

}

foreach ($obj as $key => $value) {

}

cSharp

for (int i = 0; i < 10; i++) {
  Debug.WriteLine(i);
}

foreach (Post record in posts) {
  Debug.WriteLine(Post.id);
}