root / trunk / web / dojo / dojox / lang / functional / fold.js @ 13
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/*
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Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojox.lang.functional.fold"]){ |
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dojo._hasResource["dojox.lang.functional.fold"]=true; |
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dojo.provide("dojox.lang.functional.fold");
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dojo.require("dojox.lang.functional.lambda");
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(function(){
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var d=dojo,df=dojox.lang.functional,_1={};
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d.mixin(df,{foldl:function(a,f,z,o){
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if(typeof a=="string"){ |
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a=a.split("");
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} |
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o=o||d.global; |
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f=df.lambda(f); |
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var i,n;
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if(d.isArray(a)){
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for(i=0,n=a.length;i<n;z=f.call(o,z,a[i],i,a),++i){ |
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} |
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}else{
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if(typeof a.hasNext=="function"&&typeof a.next=="function"){ |
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for(i=0;a.hasNext();z=f.call(o,z,a.next(),i++,a)){ |
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} |
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}else{
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for(i in a){ |
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if(!(i in _1)){ |
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z=f.call(o,z,a[i],i,a); |
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} |
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} |
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} |
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} |
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return z;
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},foldl1:function(a,f,o){ |
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if(typeof a=="string"){ |
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a=a.split("");
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} |
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o=o||d.global; |
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f=df.lambda(f); |
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var z,i,n;
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if(d.isArray(a)){
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z=a[0];
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for(i=1,n=a.length;i<n;z=f.call(o,z,a[i],i,a),++i){ |
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} |
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}else{
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if(typeof a.hasNext=="function"&&typeof a.next=="function"){ |
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if(a.hasNext()){
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z=a.next(); |
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for(i=1;a.hasNext();z=f.call(o,z,a.next(),i++,a)){ |
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} |
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} |
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}else{
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var _2=true; |
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for(i in a){ |
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if(!(i in _1)){ |
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if(_2){
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z=a[i]; |
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_2=false;
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}else{
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z=f.call(o,z,a[i],i,a); |
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} |
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} |
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} |
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} |
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} |
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return z;
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},foldr:function(a,f,z,o){ |
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if(typeof a=="string"){ |
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a=a.split("");
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} |
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o=o||d.global; |
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f=df.lambda(f); |
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for(var i=a.length;i>0;--i,z=f.call(o,z,a[i],i,a)){ |
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} |
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return z;
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},foldr1:function(a,f,o){ |
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if(typeof a=="string"){ |
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a=a.split("");
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} |
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o=o||d.global; |
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f=df.lambda(f); |
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var n=a.length,z=a[n-1],i=n-1; |
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for(;i>0;--i,z=f.call(o,z,a[i],i,a)){ |
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} |
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return z;
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},reduce:function(a,f,z){ |
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return arguments.length<3?df.foldl1(a,f):df.foldl(a,f,z); |
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},reduceRight:function(a,f,z){ |
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return arguments.length<3?df.foldr1(a,f):df.foldr(a,f,z); |
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},unfold:function(pr,f,g,z,o){ |
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o=o||d.global; |
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f=df.lambda(f); |
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g=df.lambda(g); |
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pr=df.lambda(pr); |
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var t=[];
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for(;!pr.call(o,z);t.push(f.call(o,z)),z=g.call(o,z)){
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} |
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return t;
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}}); |
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})(); |
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} |