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Comment by idle_zealot

16 hours ago

Does it count as 0-indexing when your 0 is a floating point number?

5 comments

idle_zealot

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krackers  16 hours ago

Actually in JS array indexing is same as property indexing right? So it's actually looking up the string '0', as in arr['0']

  • idle_zealot  15 hours ago

    Huh. I always thought that JS objects supported string and number keys separately, like lua. Nope!

      [Documents]$ cat test.js
  let testArray = [];
  testArray[0] = "foo";
  testArray["0"] = "bar";
  console.log(testArray[0]);
  console.log(testArray["0"]);
  [Documents]$ jsc test.js
  bar bar
  [Documents]$

    • nvlled  10 hours ago

      Lua supports even functions and objects as keys:

        function f1() end
  function f2() end
  local m1 = {}
  local m2 = {}
  local obj = {
      [f1] = 1,
      [f2] = 2,
      [m1] = 3,
      [m2] = 4,
  }
  print(obj[f1], obj[f2], obj[m1], obj[m2], obj[{}])

      Functions as keys is handy when implementing a quick pub/sub.

    • aidenn0  15 hours ago

      They do, but strings that are numbers will be reinterpreted as numbers.

      [edit]

        let testArray = [];
  testArray[0] = "foo";
  testArray["0"] = "bar";
  testArray["00"] = "baz";
  console.log(testArray[0]);
  console.log(testArray["0"]);
  console.log(testArray["00"]);

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