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function mapper(f)
{
return function(a){ return map(a,f);}; //
}
var increment = function(x){return x+1;};
var incrementer = mapper(increment);
incrementrt([1,2,3]) //==>[2,3,4]
var map =Array.prototype.map
?function(a,f){return a.map(f);}
:function(a,f)
{
var results =[];
for(var i=0,len=a.len;i++)
{
if(i in a) results[i] =f.call(null,a[i],i,a);
}
return results;
};
//Return a function that expects an array argument and applies f to each element, returning ths arrat of return values.
//Contrast this with the map() function from earlier.
function mapper(f)
{
return function(a){ return map(a,f);};
}
var increment = function(x){return x+1;};
var incrementer = mapper(increment);
incremener([1,2,3]) //==>[2,3,4]
map() 方法是数组方法
用法如
var arr=[1,2,3,4,5];
var arr1 = arr.map(function(x){return x+1;}); //得到[2,3,4,5,6]