JavaScript 相当于 Ruby 的 .each

Question

JavaScript 是否有与 Ruby 的 .each 方法等效的方法？

例如 ruby :

arr = %w(1 2 3 4 5 6 7 8 9 10)
arr.each do |multi|
  sum = multi * 2
  puts "The sum of #{multi} ^ 2 = #{sum}"
end
#<=The sum of 1 ^ 2 = 11
   The sum of 2 ^ 2 = 22
   The sum of 3 ^ 2 = 33
   The sum of 4 ^ 2 = 44
   The sum of 5 ^ 2 = 55
   The sum of 6 ^ 2 = 66
   The sum of 7 ^ 2 = 77
   The sum of 8 ^ 2 = 88
   The sum of 9 ^ 2 = 99
   The sum of 10 ^ 2 = 1010

JavaScript 有类似的东西吗？

Answer 1

您正在寻找Array.prototype.forEach功能

var arr = ['1', '2', '3', '4', '5'];
arr.forEach(multi => {
    var sum = multi.repeat(2);
    console.log(`The sum of ${multi} ^ 2 = ${sum}`);
});

工作示例:

var arr = ['1', '2', '3', '4', '5'];
arr.forEach(multi => {
    var sum = multi.repeat(2);
    document.write(`The sum of ${multi} ^ 2 = ${sum}</br>`);
});