splice | 易学教程

Image Spliced into tiles with animation - iOS

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问题 I'm trying to splice an image and then have a transition to next one something like this? Any suggestions on where to start from? Is it possible to splice the images into small tiles and animate them with UIView animations? Here is a sample. EDIT: '#define DESIRED_WIDTH 40 '#define DESIRED_HEIGHT 60 - (void)viewDidLoad { [super viewDidLoad]; UIImage *bigImage = [UIImage imageNamed:@"background_for_Manager_App.png"]; CGRect frame = CGRectMake(0.0, 0.0, DESIRED_WIDTH, DESIRED_HEIGHT); int

Remove object in array using filter and splice which one is best approach in angular2?

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问题 Hi I delete an object in an array using two approaches:- splice and filter. splice code here:- (this.myArray).splice((this.myArray).indexOf(myobject), 1); filter code here:- (this.myArray).filter(obj => obj !== myobject); Please tell us differences between both and which one is the best approach? 回答1: Check this performance test out. It's has not that much to do with Angular, but more with JavaScript. If you're able just go for the fastest method available :) 回答2: I think that the main

vmsplice() and TCP

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问题 In the original vmsplice() implementation, it was suggested that if you had a user-land buffer 2x the maximum number of pages that could fit in a pipe, a successful vmsplice() on the second half of the buffer would guarantee that the kernel was done using the first half of the buffer. But that was not true after all, and particularly for TCP, the kernel pages would be kept until receiving ACK from the other side. Fixing this was left as future work, and thus for TCP, the kernel would still

Why am I getting this output from this simple splice command?

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问题 I have a small issue with understanding why I'm getting this output. var arr = ["a", "b", "c", "d", "e", "f"]; arr.splice(2,0,"1"); console.log(arr); var arr2 = ["a", "b", "c", "d", "e", "f"]; arr2 = arr2.splice(2,0,"2"); console.log(arr2); ouput is: [ 'a', 'b', '1', 'c', 'd', 'e', 'f' ] [] Why is the second line of output not: [ 'a', 'b', '2', 'c', 'd', 'e', 'f' ] Is it an issue of assignment or what? 回答1: Reading about splice method. It returns An array containing the removed elements. If

Linux零拷贝之sendfile/splice

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sendfile/splice实现了真正意义上的零拷贝：CPU完全不需要参与数据的拷贝，应用层Java NIO为开发人员提供了FileChannel.transferFrom()/transferTo()方法使用零拷贝。 sendfile 传输原理用户进程通过 sendfile() 函数向内核（kernel）发起系统调用，上下文从用户态（user space）切换为内核态（kernel space）； CPU 利用 DMA 控制器将数据从主存或硬盘拷贝到内核空间（kernel space）的读缓冲区（read buffer）； CPU 把读缓冲区（read buffer）的文件描述符（file descriptor）和数据长度拷贝到网络缓冲区（socket buffer）；基于已拷贝的文件描述符（file descriptor）和数据长度，CPU 利用 DMA 控制器的 gather/scatter 操作直接批量地将数据从内核的读缓冲区（read buffer）拷贝到网卡进行数据传输；上下文从内核态（kernel space）切换回用户态（user space），Sendfile 系统调用执行返回；适用场景 sendfile适用于文件数据到网卡的传输过程，并且用户程序对数据没有修改的场景； splice 传输原理用户进程通过 splice() 函数向内核

JS系列：js数组的常用方法

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关于js数组常用方法的剖析数组也是对象数据类型的，也是由键值对组成的 var ary = [ 12 , 23 , 34 ] ; 一维数组 /* * 结构 * 0:12 * 1:23 * 2:34 * length：3 */ 1. 以数字作为索引（属性名），索引从 0 开始递增 2. 有一个length属性，存储的是数组长度 ary [ 0 ] 获取第一项 ary [ ary . length - 1 ] 获取最后一项数组中每一项的值可以是任何数据类型的 //多维数组 var ary = [ { name : 'xxx' , age : 20 } ; { name : 'xxx' , age : 20 } ] ; 数组中的常用方法按照四个维度记忆：方法的作用方法的参数 -方法的返回值原有数组是否改变 push 作用: 向数组末尾增加新的内容参数：追加的内容（可以是一个，也可以是多个）返回值：新增数组的长度原有数组改变 var ary = [ 12 , 23 , 34 ] ; ary . push ( 100 ) ; => 4 ary： [ 12 , 23 , 34 , 100 ] ary . push ( 100 , 222 , { name : 'xx' , age : 200 } ) ; => 10 ary : [ 12 , 23 , 34 , 100 ,

Common Lisp: How to build a list in a macro with conditional splicing?

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问题 Let's assume: (defmacro testing (&optional var) `(list 'this 'is ,@(when (consp var) `('a 'list)))) when called: >(testing 2) (THIS IS) >(testing (list 1 2)) (THIS IS A LIST) which is what I wanted. But now, when I pass a parameter that is a list: >(defparameter bla (list 1 2 3)) BLA >(testing bla) (THIS IS) which I suppose is because the macro would check (consp bla) where bla is a symbol, instead of the list? How do I prevent this? Thanks 回答1: You could do something like: (defmacro testing

js数组

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JavaScript的Array可以包含任意数据类型，并通过索引来访问每个元素。要取得Array的长度，直接访问length属性： var arr = [1, 2, 3.14, ‘Hello’, null, true]; arr.length; // 6 请注意，直接给Array的length赋一个新的值会导致Array大小的变化： var arr = [1, 2, 3]; arr.length; // 3 arr.length = 6; arr; // arr变为[1, 2, 3, undefined, undefined, undefined] arr.length = 2; arr; // arr变为[1, 2] Array可以通过索引把对应的元素修改为新的值，因此，对Array的索引进行赋值会直接修改这个Array： var arr = [‘A’, ‘B’, ‘C’]; arr[1] = 99; arr; // arr现在变为[‘A’, 99, ‘C’] 请注意，如果通过索引赋值时，索引超过了范围，同样会引起Array大小的变化： var arr = [1, 2, 3]; arr[5] = ‘x’; arr; // arr变为[1, 2, 3, undefined, undefined, ‘x’] 大多数其他编程语言不允许直接改变数组的大小，越界访问索引会报错。然而

Get correct index with Splice()

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问题 I'm attempting to delete items from my AngularJS view. From the view, I'm passing the index & the ID. In the JS controller, I splice(index) from the AngularJS array/model. And I pass the ID to a $http.get to call a delete to my database. This all works. .... Until I make a request to refresh my page. Every 5 seconds I make a request to update the Angular model and I concat any new data to it. But what I'm finding is it screws up my index values. I assumed it was reordering my index: and

vue动态改变数组中对象的属性，视图不刷新的问题

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Vue 不能检测这样变动的数组： arr[1]="aaa"; 这样赋值的数据改变是 vue动态数据驱动视图机制监听不到的要用splice等改变原数组等的方法才能被监听到 var zanarray = [1,2,3,4,5]; document.write(zanarray + "<br />"); zanarray.splice(2,0,"1"); document.write(zanarray); 来源： https://www.cnblogs.com/panghu123/p/12020589.html