grep vs jQuery过滤？ [英] Grep vs Filter in jQuery?

问题描述

将匹配元素的集合减少为与选择器匹配的元素，或
传递函数的测试。

Grep：

查找满足过滤器
函数的数组的元素。原始数组不受影响。

确定。

$ b $所以如果我在GREP中这样做的话：

$ $ p $ $ $ c $ var arr = [1，9，3，8，6， 1，5，9，4，7，3，8，6，9，1];

myNewArray = jQuery.grep（arr，function（n，i）{
return（n！= 5& i> 4）;
}）;

我也可以这样做：

<$ p $变量arr = [1，9，3，8，6，1,5，9，

myNewArray = $（arr）.filter（function（n，i）{
return（n！= 5& i> 4）;
}） ;

在这两种情况下，我仍然可以访问原始数组...

so ...在哪里有区别？

解决方案

不同的用法。过滤函数用于html元素，这就是为什么它是一个可链接的函数，它返回一个jQuery对象，它接受像：even这样的过滤器， ，：odd或：visible等等。你不能用grep函数来实现这个功能，而grep函数是用来作为数组的实用函数的。

I was wondering about the differences between Grep and Filter :

Filter :

Reduce the set of matched elements to those that match the selector or pass the function's test.

Grep :

Finds the elements of an array which satisfy a filter function. The original array is not affected.

ok.

so if I do this in GREP :

var arr = [ 1, 9, 3, 8, 6, 1, 5, 9, 4, 7, 3, 8, 6, 9, 1 ];

myNewArray= jQuery.grep(arr, function(n, i){
  return (n != 5 && i > 4);
});

I could do also :

 var arr = [ 1, 9, 3, 8, 6, 1, 5, 9, 4, 7, 3, 8, 6, 9, 1 ];

myNewArray= $(arr).filter( function(n, i){
  return (n != 5 && i > 4);
});

In both situations I still can access to the original array...

so...where is the difference ?

解决方案

They both function in similar ways however they differ in their usages.

The filter function is intended to be used with html elements, and that is why it is a chainable function that returns a jQuery object and it accepts filters like ":even", ":odd" or ":visible" etc. You can't do that with the grep function, which is intended to be a utility function for arrays.

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