List_for_FP: A JavaScript repository from shd101wyy

#List for FP

By Yiyi Wang

list data structure for functional programming

How to use

include list.js

<script src="list.js"></script>
<script>
    var my_list = list(1, 2, 3, 4);
</script>

Code Structure

$List

```
  . first
```
```
  . rest  
```

$List.prototype.length
$List.prototype.toString
$List.prototype.reverse
$List.prototype.slice
$List.prototype.ref
$List.prototype.append
$List.prototype.toArray
$List.prototype.forEach
$List.prototype.foreach
$List.prototype.map
$List.prototype.filter

list
cons
car
cdr

API (demo under ECMAScript 6 (ECMAScript 5 Compatible))

create list

 var x = list(1, 2, 3, 4);
 var y = list(3, 4, 5, 6);

cons list (like lisp)

var x = cons(1, cons(2, cons(3, cons(4, null))));
var y = cons(2, 3);

access element in list (like lisp)

var x = list(1, 2, 3, 4);
car(x);                              // 1              get first element
cdr(x);                              // (2, 3, 4)      get rest elements

var x = list(1, 2, 3);
x.first                             // 1             get first element
x.rest                              // (2, 3, 4)     get rest element

toString

var x = list(1, 2, 3);
console.log(x.toString());          // string "(1, 2, 3)"

length

var x = list(1, 2, 3);
x.length();                        // 3

reverse

var x = list(1, 2, 3);
x.reverse();                       // (3, 2, 1)

slice

var x = list(1, 2, 3, 4, 5, 6);
x.slice(2);                           // (3, 4, 5, 6)        slice starting from 2
x.slice(-2);                          // (5, 6)  slice 2 elements from end
x.slice(2, 4);                        // (3, 4)  slice between offsets 2 and 4  [2, 4)

ref

var x = list(1, 2, 3, 4, 5, 6);
x.ref(1);                            // 2
x.ref(-2)                            // 5

append

var x = list(1, 2, 3); 
x.append(4, 5);                     // (1, 2, 3, 4, 5)
x.append(4);                        // (1, 2, 3, 4)

toArray

var x = list(1, 2, 3);
x.toArray();                       // [1, 2, 3]

forEach / foreach

var x = list(1, 2, 3, 4, 5, 6);
x.foreach(i => console.log(i));    // 1 2 3 4 5 6

map

var x = list(1, 2, 3);
x.map(i => i * 2);                // (2, 4, 6)

filter

var x = list(-3, 4, -12, 7, 10, -1);
x.filter(i => i > 0);            // (4, 7, 10)

==============================================================================================
The MIT License (MIT) Copyright (c) 2014 YiyiWang

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

shd101wyy/List_for_FP