Frontend Development 4 min read
Can You Write Hello World in JavaScript with Just Six Characters?
This article introduces the classic Hello World example in JavaScript, demonstrates the standard alert implementation, then challenges readers to output Hello World using only six characters through JSFuck techniques, explaining the underlying type coercion, array creation, and operator tricks that make it possible.
Programmer DD
Programmer DD
Hello World is familiar to every developer; it is often the first program when learning a new language or framework.
In JavaScript you can output Hello World with a simple alert: alert("Hello World"); Embedded in HTML it looks like this:
<html>
<script type="text/javascript">
alert("Hello World");
</script>
</html>Opening the HTML in a browser displays the Hello World message.
Challenge: Write JavaScript with Only Six Characters
The standard alert statement uses 13 characters. The challenge is to achieve the same output using only six characters: (, ), +, [, ], and !. These characters can be combined using JavaScript’s type coercion and array operations to construct the string "Hello World".
Answer
<html>
<script type="text/javascript">
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(truncated for brevity)These six characters work because JavaScript’s type system automatically converts values during operations, allowing us to build strings and numbers from boolean and array literals.
Why It Works
The six characters can be grouped into three categories: [ and ] create arrays. ! and + perform logical negation and addition, which trigger type coercion. ( and ) group operations.
By combining these operations we can extract characters from the strings "false" and "true", convert booleans to numbers (0 and 1), and concatenate them to form the desired output.
References
https://www.cnblogs.com/lzkwin/p/12131718.html
http://www.jsfuck.com/
Original Source
Signed-in readers can open the original source through BestHub's protected redirect.
Republication Notice
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Written by
Programmer DD
A tinkering programmer and author of "Spring Cloud Microservices in Action"
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