## Hello, world!

    "Hello, world!"

## Lambda functions

### Increment

    5 [7+]! . {Outputs 12.}

### Square numbers

    [$*] s: 7s;! . {Outputs 49.}

## Conditions

### Equal, less, or greater than

    5x:
    7y:
    x;y;=
    $
    x;
    .
    [" equals "]?
    ~[
        x;y;>
        $
        [" is greater than "]?
        ~[" is less than "]?
    ]?
    y;
    .

## Loops

### English alphabet

    'Ai: 'Zm: 1m;+ m: [m;i;>][i;, 1i;+ i:]#

### Ten Green Bottles

    [$ . " green bottle" 1> ["s"]? ".
    "] f:
    10n: [n;0>][n;f;! n;1- n:]#

## User input

### Reverse a string

    "Enter the string character by character (or a space to finish):
    "0i: [ß ^ $ 32=~][i;1+ i:]# % "Reverse: " [i;0>][, i;1- i:]#