predef

Implicit references (implicit Import)Scala automatically adds several implicit references to each program, just as the Java program automatically adds a Java.lang package. In Scala, the contents of the following three packages are implicitly referenced to each program. The difference is that Scala also implicitly adds a reference to the Predef, which greatly facilitates the programmer's work.import// in JVM projects, or system namespace in .NETimport

fictional class after the single object was compiled into a class file. The name of the fictitious class is Main$.class. A fictional class has a member method main with the same name. The main logic of the Scala entry function is in this main method. As for the implementation of the single example object, there are several articles that have been introduced before, and no longer repeat here. Unclear readers can refer to a few previous blogs: Learn Scala: Starting from HelloWorld Learning Scala

In the first two articles, to run the scala. Net program, we need to copy predef. DLL to the current directory. This is unpleasant. First, I thought of adding predef. DLL to the Global Assembly Cache (GAC, Global Assembly Cache), as shown below: ben@ben-m4000t:~$ sudo gacutil -i /opt/scala-2.7.7.final/lib/predef.dllFailure adding assembly /opt/scala-2.7.7.final/lib/predef.dll to the cache: Attempt to inst

element using the name subscript of forms; 2. Submitting the form (1). Through event objects, you can block the default behavior of submit, the default behavior of the Submit event is to carry data to the specified page; Copy Code code as follows: ADDEVENT (FM, ' Submit ', function (evt) { Predef (EVT); }); (2). We can use the Submit () method to customize the triggering of a submit event, that is, not necessarily clic

digital subscript of forms to obtain the element;Document. forms ['myform']; // obtain the element using the name subscript of forms; 2. submit the form (1). Through the event object, you can prevent the default behavior of the submit event. The default behavior of the submit event is to carry data to jump to the specified page; Copy codeThe Code is as follows:AddEvent (fm, 'submit ', function (evt ){PreDef (evt );}); (2) We can use the submit () met

Filter Input--JS Summary1. Filter the input two modes:1.1 Prohibit or block input of non-numeric keys, prevent the default behavior of non-numeric keys1.2 After the verification is canceled, you can first enter the illegal characters, then judge, cancel the text just entered2. Achieve:2.1 Method: Forbid ... Default behavior"Reference encapsulation: encapsulating the underlying code"addevent (window, ' Load ', function () {var fm = document.getElementById (' MyForm '); var user = fm.elements['

exampleobject Test{ var"helloworld" def helloworld(): Unit = { println("helloworld") } def main(args: Array[String]) { println(Test) }}The results of running in REPL are as follows:D:\> scalac Test.scalaD:\> scala TestTest$@3eb25e1aD:\>To this, summarize, for object Test{...} , we are in use Test.field or Test.method when, Test is actually a global singleton object, and not a class, the following through the anti-compilation of the class file to look at the specifi

implicitConversion() = { val x = 1 val y = 2 x.compareTo(y)}After decompiling, the following Java code is obtained: int x = 1;int y = 2;Integer boxedX = scala.Predef$.MODULE$.int2Integer(x);Integer boxedY = scala.Predef$.MODULE$.int2Integer(y);boxedX.compareTo(boxedY);The implicit conversion method is defined in predef. The corresponding code of predef is as follows: object

; can implement this function, but there is a loophole; first: it must be written to the last, which causesAfter execution of the middle code, it is possible to perform a return false; second: return false writes to the lastThe definition operation is invalidated. So, the best way to do this is to block the default behavior at the top, and you can do it laterCode. Link.onclick = function (evt) { Evt.preventdefault (); Stop the default behavior and place it wherever you are Alert

Blog Core content:1. Two implicit conversion mechanisms in Scala and how implicit views are defined2. Where the implicit binding in Scala might be located and how to use implicit conversions better3. Implicit conversion related operation rules in Scala4. Implicit parameters in Scala5. Implicit classes in Scala6. An implicit object in Scala7. Two implicit type constraints in Scala (combined with the type system in Scala)8. Introduction to the usage of the implicitly method in the

(_). The only difference between them is that the etext, edata, and end symbols are not defined in ANSI, POSIX, and other standards. 　　 When the program is started, its brk is in the same position as _ end. However, the system calls sys_brk (), memory allocation function malloc (), and standard input/output operations to change the location. Therefore, the current brk position of the program needs to be obtained using sbrk. Note that these variable names must be considered addresses. Therefore,

the beginning, the subsequent custom operations will become invalid.So the best way is to stop the default behavior at the beginning, and the subsequent code can be executed. Link. onclick = function (evt) {evt. preventDefault; // w3c, blocking default behavior alert ('lil');} link. onclick = function (evt) {window. event. returnValue = false; // IE, blocks the default behavior alert ('lil ');} Cross-browser compatibility: function preDef(evt){ var e

=function(){ alert('Lee'); return false;} PS: Although return false; can implement this function, there is a vulnerability.First, it must be written to the end. As a result, after the winning code is executed, return false may not be executed;Second, if return false is written to the beginning, the subsequent custom operations will become invalid.So the best way is to stop the default behavior at the beginning, and the subsequent code can be executed. Link. onclick = function (evt) {evt. preve

. Link.onclick=function (evt) { evt.preventdefault;//w3c, blocking default behavior alert (' Lee '); } Link.onclick=function (evt) { window.event.returnvalue=false;//ie, blocking default behavior alert (' Lee '); } Cross-browser compatibility: function Predef (evt) { var e=evt | | window.event; if (e.preventdefault) { e.preventdefault (); } else{ e.returnvalue=false } } Right-click menu ContextMenuCompatible:

additions to the event object:1. Under the MouseOver and Mouseout events, get the DOM objects that are moved in and out from, using the Relatedtarget propertyie, move in with Fromelement, move out with toelementExample: Compatible code:function Gettarget (evt) {var e = evt | | window.event;if (e.srcelement) {//IE underif (E.type = = "MouseOver") {return E.fromelement;} else if (E.type = = "Mouseout") {return E.toelement;} else if (e.relatedtarget) {//return E.relatedtarget; }}}2. Block default

:" + environment. osversion); console. writeline ("CLR version: {0} ({1})", environment. version, skyiv. runtimeframework. currentframework); console. writeline ("default encoding:" + system. text. encoding. default );} The change is to add the currentframework attribute of the runtimeframework class, which is in the sourceProgramCodeThis can be found in the article ". NET Framework CLR version check", which is not repeated here. Finally, it is the MAKEFILE file: AllSource codeAll

course, You can also download the latest Linux installation package for Scala 2.7.7 on the official Scala website without using the apt-GET command in the Ubuntu operating system, this will be installed together in a centralized manner, and you can also have the sbaz tool. Of course, at this time, the supervisor is responsible for upgrading and updating the scala software package. the Ubuntu operating system will not help you upgrade and update the software package that is not installed using t

Result: 1. Dummy text, printed before inititalization of C 2. This is the initialization code of C 3. Hello Spark　　question: How to pass the encapsulated initialization code block to Delayedinit (body: = = Unit)?With the anti-compilation tool Jd-gui.exe the. Class generated above, you can see a lot more classes,Among the majorClass Appinternals, Delayedinitbody,appInterNAls , C, Delayedinitboy ,h Elp er ,h Elp er class Delayedinit$body appears two times, once in Appin

the subsequent custom operation will fail; // solution: Stop the default action at the beginning, and the code can be executed later; function preDef (evt) {// cross-browser compatibility prevents default behavior; var e = evt | window. event; if (e. preventDefault) {e. preventDefault (); // W3C, blocking default behavior;} else {e. returnValue = false; // IE, blocking default behavior ;}} 3. context Menu event contextmenu // when we right-click th

\commons-io\2.4\commons-io-2.4.jar; F:\repo\org\tachyonproject\tachyon-underfs-hdfs\0.8.2\tachyon-underfs-hdfs-0.8.2.jar; F:\repo\org\tachyonproject\tachyon-underfs-s3\0.8.2\tachyon-underfs-s3-0.8.2.jar; F:\repo\org\tachyonproject\tachyon-underfs-local\0.8.2\tachyon-underfs-local-0.8.2.jar; F:\repo\net\razorvine\pyrolite\4.9\pyrolite-4.9.jar; F:\repo\net\sf\py4j\py4j\0.9\py4j-0.9.jar; F:\repo\org\spark-project\spark\unused\1.0.0\unused-1.0.0.jar; F:\repo\org\scala-lang\scala-library\2.10.5\scala