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Can you do it with only six characters?

2020-11-08 09:40:09 osc_tjhvpz8x

Hello World It's no stranger to every developer , Because when we learn any language or framework , There will be one Hello World To help us get started .

If we use JavaScript To output Hello World Words , It can be written like this :

alert("Hello World");

Put in HTML:

<html>
  <script type="text/javascript">
    alert("Hello World");
  </script>
</html>

Open it in the browser to output the following situation Hello World 了 :

Challenge : It's written in six characters JavaScripte

Up there we are JavaScript To realize Hello World When , remove HTML Related tags and attributes , The implementation statement above alert("Hello World"); All in all 13 Characters , So is there any way to achieve the same function with fewer characters ? Today we're going to challenge : Is there any way to just use 6 Three characters to write JavaScripte Program , In order to realize the Hello World Output ?

... ... ...

Think about it first , Do you have any ideas ? If you have no idea , Here's a hint ...

... ... ... ... ... ... ...

Tips : Use these six characters :(,),+,[,],!

... ... ... ... ... ... ...

Think again , Do you have any ideas ? If you have no idea , Here are the answers and explanations ...

... ... ... ... ... ... ...

answer

<html>
<script type="text/javascript">
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</script>
</html>

what ? You don't believe it can output Hello World? So you can copy it , Put it in HTML In file , Open it again !

Why? ?

Why can we just use this 6 Three characters to write these weird JavaScript Code ? This is entirely due to JavaScript Unique type system and conversion mechanism .

above 6 There are three types of characters :

  • [,]: Used to create arrays
  • !,+: Perform some operations on arrays
  • (,): Group operations

Basic principle

  • [] Can be used to create arrays , and ![] You can return false
  • Predefined rules :2 + true, Will translate into 2 + 1, Finally get 3
  • Predefined rules :2 + "2", Will translate into 2 + "2", Finally get "22"

Extracting letters ![] Can get false,![] + [] You can get "false" character string , So we can get the letters from the subscript , such as :(![] + [])[1] Can get false The second letter in a string a

Extract numbers ![] Can get false, because +false Can get 0, therefore +![] I can get it 0; because +true Can get 1, therefore +!![] I can get it 1. In this way, more other numbers can be obtained by operation

Okay , With these basics , You know how the magic answer came from ?

First article : It's done in six characters Hello World, Can you do that? ?, Please indicate the link of the article

Reference material

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