root / trunk / web / dojo / dojox / lang / functional / fold.js @ 11
History | View | Annotate | Download (1.96 KB)
| 1 | 9 | andrej.cim | /*
|
|---|---|---|---|
| 2 | Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
|
||
| 3 | Available via Academic Free License >= 2.1 OR the modified BSD license.
|
||
| 4 | see: http://dojotoolkit.org/license for details
|
||
| 5 | */
|
||
| 6 | |||
| 7 | |||
| 8 | if(!dojo._hasResource["dojox.lang.functional.fold"]){ |
||
| 9 | dojo._hasResource["dojox.lang.functional.fold"]=true; |
||
| 10 | dojo.provide("dojox.lang.functional.fold");
|
||
| 11 | dojo.require("dojox.lang.functional.lambda");
|
||
| 12 | (function(){
|
||
| 13 | var d=dojo,df=dojox.lang.functional,_1={};
|
||
| 14 | d.mixin(df,{foldl:function(a,f,z,o){
|
||
| 15 | if(typeof a=="string"){ |
||
| 16 | a=a.split("");
|
||
| 17 | } |
||
| 18 | o=o||d.global; |
||
| 19 | f=df.lambda(f); |
||
| 20 | var i,n;
|
||
| 21 | if(d.isArray(a)){
|
||
| 22 | for(i=0,n=a.length;i<n;z=f.call(o,z,a[i],i,a),++i){ |
||
| 23 | } |
||
| 24 | }else{
|
||
| 25 | if(typeof a.hasNext=="function"&&typeof a.next=="function"){ |
||
| 26 | for(i=0;a.hasNext();z=f.call(o,z,a.next(),i++,a)){ |
||
| 27 | } |
||
| 28 | }else{
|
||
| 29 | for(i in a){ |
||
| 30 | if(!(i in _1)){ |
||
| 31 | z=f.call(o,z,a[i],i,a); |
||
| 32 | } |
||
| 33 | } |
||
| 34 | } |
||
| 35 | } |
||
| 36 | return z;
|
||
| 37 | },foldl1:function(a,f,o){ |
||
| 38 | if(typeof a=="string"){ |
||
| 39 | a=a.split("");
|
||
| 40 | } |
||
| 41 | o=o||d.global; |
||
| 42 | f=df.lambda(f); |
||
| 43 | var z,i,n;
|
||
| 44 | if(d.isArray(a)){
|
||
| 45 | z=a[0];
|
||
| 46 | for(i=1,n=a.length;i<n;z=f.call(o,z,a[i],i,a),++i){ |
||
| 47 | } |
||
| 48 | }else{
|
||
| 49 | if(typeof a.hasNext=="function"&&typeof a.next=="function"){ |
||
| 50 | if(a.hasNext()){
|
||
| 51 | z=a.next(); |
||
| 52 | for(i=1;a.hasNext();z=f.call(o,z,a.next(),i++,a)){ |
||
| 53 | } |
||
| 54 | } |
||
| 55 | }else{
|
||
| 56 | var _2=true; |
||
| 57 | for(i in a){ |
||
| 58 | if(!(i in _1)){ |
||
| 59 | if(_2){
|
||
| 60 | z=a[i]; |
||
| 61 | _2=false;
|
||
| 62 | }else{
|
||
| 63 | z=f.call(o,z,a[i],i,a); |
||
| 64 | } |
||
| 65 | } |
||
| 66 | } |
||
| 67 | } |
||
| 68 | } |
||
| 69 | return z;
|
||
| 70 | },foldr:function(a,f,z,o){ |
||
| 71 | if(typeof a=="string"){ |
||
| 72 | a=a.split("");
|
||
| 73 | } |
||
| 74 | o=o||d.global; |
||
| 75 | f=df.lambda(f); |
||
| 76 | for(var i=a.length;i>0;--i,z=f.call(o,z,a[i],i,a)){ |
||
| 77 | } |
||
| 78 | return z;
|
||
| 79 | },foldr1:function(a,f,o){ |
||
| 80 | if(typeof a=="string"){ |
||
| 81 | a=a.split("");
|
||
| 82 | } |
||
| 83 | o=o||d.global; |
||
| 84 | f=df.lambda(f); |
||
| 85 | var n=a.length,z=a[n-1],i=n-1; |
||
| 86 | for(;i>0;--i,z=f.call(o,z,a[i],i,a)){ |
||
| 87 | } |
||
| 88 | return z;
|
||
| 89 | },reduce:function(a,f,z){ |
||
| 90 | return arguments.length<3?df.foldl1(a,f):df.foldl(a,f,z); |
||
| 91 | },reduceRight:function(a,f,z){ |
||
| 92 | return arguments.length<3?df.foldr1(a,f):df.foldr(a,f,z); |
||
| 93 | },unfold:function(pr,f,g,z,o){ |
||
| 94 | o=o||d.global; |
||
| 95 | f=df.lambda(f); |
||
| 96 | g=df.lambda(g); |
||
| 97 | pr=df.lambda(pr); |
||
| 98 | var t=[];
|
||
| 99 | for(;!pr.call(o,z);t.push(f.call(o,z)),z=g.call(o,z)){
|
||
| 100 | } |
||
| 101 | return t;
|
||
| 102 | }}); |
||
| 103 | })(); |
||
| 104 | } |