object

What is the end of prototype chain in javascript — null or Object.prototype?

由 女生的网名这么多〃 提交于 2020-01-11 09:43:47
问题 I've been reading about prototype chain in JavaScript and came to two slightly different definitions. It is said that every object in JavaScript has a prototype and that prototype in turn has another prototype. The top prototype(Grand) may also have prototype and the chain can continue. Now the chain will stop at one last object. JavaScript the Good parts says the chain terminates at Object.prototype and MDN says null is the final link where the chain terminates. Javascript: The Good Parts

Access object created in one class into another

由 喜夏-厌秋 提交于 2020-01-11 09:14:46
问题 I have a primary class as below: public class classB{ public classC getObject(String getstring){ return new classC(getstring); } } The classC has a contructor: public class classC{ String string; public classC(String s){ this.string = s; } public methodC(int i){ <using the `string` variable here> } } Now I've a classA which will be using the object created in classB (which is of course, an instance of classC ). public classA{ int a = 0.5; <Get the object that was created in classB>.methodC(a)

Access object created in one class into another

由 痞子三分冷 提交于 2020-01-11 09:14:11
问题 I have a primary class as below: public class classB{ public classC getObject(String getstring){ return new classC(getstring); } } The classC has a contructor: public class classC{ String string; public classC(String s){ this.string = s; } public methodC(int i){ <using the `string` variable here> } } Now I've a classA which will be using the object created in classB (which is of course, an instance of classC ). public classA{ int a = 0.5; <Get the object that was created in classB>.methodC(a)

Is it possible to change the class of a Ruby object?

由 末鹿安然 提交于 2020-01-11 08:29:25
问题 Is it possible to change the class of a Ruby object once it has been instantiated, something like: class A end class B end a = A.new a.class = B or similar. (the above code does not run as class is a read only variable) I know this is not advisable, a bit strange, and not something I plan on doing, but is it possible? 回答1: No, this is not possible from within ruby. It is theoretically possible from within a C extension by changing the klass pointer of the given object, but it should be noted

How to implement reference counted objects in Delphi

由 亡梦爱人 提交于 2020-01-11 07:33:09
问题 I have a graph like structure. I don't know exactly when to destroy the objects in traditional Delphi manner, instead I would like to implement something like reference counted objects. I know that I can use something like object.GetReference and object.Release instead of Free, and use a private variable for reference counting, but is there any better way? Thanks 回答1: If you have problems determining the correct way (place, order and so on) of destroying standard objects in a Delphi program,

How to implement reference counted objects in Delphi

由 一曲冷凌霜 提交于 2020-01-11 07:33:05
问题 I have a graph like structure. I don't know exactly when to destroy the objects in traditional Delphi manner, instead I would like to implement something like reference counted objects. I know that I can use something like object.GetReference and object.Release instead of Free, and use a private variable for reference counting, but is there any better way? Thanks 回答1: If you have problems determining the correct way (place, order and so on) of destroying standard objects in a Delphi program,

PHP Removing duplicate objects from array

由 五迷三道 提交于 2020-01-11 07:22:43
问题 I've tried all sorts of PHP logic and PHP's built in functions to remove duplicate values but it is not working no errors shows up but all my JQuery and CSS doesn't work if use array_unique() in_array() to remove the duplicate objects in my array this is how i am creating my person_row_array inside a while loop: $person_row = Person::findByID($pi_claimant_row->person_id); $person_row_array[] = $person_row; object print_r is below: Array ( [0] => stdClass Object ( [id] => 12 [flat_no] =>

PHP Removing duplicate objects from array

由 独自空忆成欢 提交于 2020-01-11 07:22:27
问题 I've tried all sorts of PHP logic and PHP's built in functions to remove duplicate values but it is not working no errors shows up but all my JQuery and CSS doesn't work if use array_unique() in_array() to remove the duplicate objects in my array this is how i am creating my person_row_array inside a while loop: $person_row = Person::findByID($pi_claimant_row->person_id); $person_row_array[] = $person_row; object print_r is below: Array ( [0] => stdClass Object ( [id] => 12 [flat_no] =>

Remove key from all objects in array

由 烂漫一生 提交于 2020-01-11 06:35:10
问题 I have the following array of objects: [{id:1, value:"100", name:"dog" ...}, {id:2, value:"200", name:"cat" ...}, {id:3, value:"300", name:"fish"....}, {id:4, value:"400", name:"mouse" ...}, {id:5, value:"500", name:"snake"...}] I want to filter the object array and keep only two keys, id and value to get something like this: [{id:1, value:"100"}, {id:2, value:"200"}, {id:3, value:"300"}, {id:4, value:"400"}, {id:5, value:"500"}] Currently, I'm traversing through the object array with a for

javascript:typeof与instanceof区别

由 China☆狼群 提交于 2020-01-11 06:25:45
from:http://www.wxwdesign.cn/article/skills/javascript_typeof_instanceof.htm JavaScript中typeof和instanceof常用来判断一个变量是否为空，或者是什么类型的。但它们之间还是有区别的： typeof typeof 是一个一元运算，放在一个运算数之前，运算数可以是任意类型。 它返回值是一个字符串，该字符串说明运算数的类型。，typeof一般只能返回如下几个结果： number,boolean,string,function,object,undefined 。 我们可以使用typeof来获取一个变量是否存在，如if(typeof a!="undefined"){alert("ok")}，而不要去使用if(a)因为如果a不存在（未声明）则会出错，对于Array,Null等特 殊对象使用typeof一律返回object，这正是typeof的局限性。 网上的一个小例子： <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">
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