control-flow

Live javascript debugging by recording function calls and parameters [duplicate]

别等时光非礼了梦想. 提交于 2019-11-28 23:23:06
This question already has an answer here: Can I override the Javascript Function object to log all function calls? 6 answers Is there a debugging system that allows me to record javascript function calls and their parameters as they occur? this would allow me to trace and debug applications in live/client situations without the performance hit due to manual logging. Edit: I'm not talking about manually calling functions using a 'console' window and viewing the results, or manually adding 'trace' or 'log' commands into my javascript. I need it to work with any running javascript. Can you

How to exit an if clause

点点圈 提交于 2019-11-28 16:09:19
What sorts of methods exist for prematurely exiting an if clause? There are times when I'm writing code and want to put a break statement inside of an if clause, only to remember that those can only be used for loops. Lets take the following code as an example: if some_condition: ... if condition_a: # do something # and then exit the outer if block ... if condition_b: # do something # and then exit the outer if block # more code here I can think of one way to do this: assuming the exit cases happen within nested if statements, wrap the remaining code in a big else block. Example: if some

Are there any static Call-Graph and/or Control-Flow-Graph API for JavaScript? [closed]

一个人想着一个人 提交于 2019-11-28 15:51:37
问题 Are there any Call-Graph and/or Control-Flow-Graph generators for JavaScript? Call Graph - http://en.wikipedia.org/wiki/Call_graph Control Flow Graph - http://en.wikipedia.org/wiki/Control_flow_graph EDIT: I am looking specifically for a static tool that let me access the graph using some API/code 回答1: To do this, you need: parsing, name resolution (handling scoping) type analysis (while JavaScript is arguably "dynamically typed", there are all kinds of typed constants including function

How Can I Avoid Using Exceptions for Flow Control?

青春壹個敷衍的年華 提交于 2019-11-28 07:20:53
问题 I have been assigned a project to develop a set of classes that act as an interface to a storage system. A requirement is that the class support a get method with the following signature: public CustomObject get(String key, Date ifModifiedSince) Basically the method is supposed to return the CustomObject associated with the key if and only if the object has been modified after ifModifiedSince . If the storage system does not contain the key then the method should return null. My problem is

Implementing ifTrue, ifFalse, ifSome, ifNone, etc. in Scala to avoid if(…) and simple pattern matching

风格不统一 提交于 2019-11-28 06:38:07
In Scala, I have progressively lost my Java/C habit of thinking in a control-flow oriented way, and got used to go ahead and get the object I'm interested in first, and then usually apply something like a match or a map() or foreach() for collections. I like it a lot, since it now feels like a more natural and more to-the-point way of structuring my code. Little by little, I've wished I could program the same way for conditions; i.e., obtain a Boolean value first, and then match it to do various things. A full-blown match , however, does seem a bit overkill for this task. Compare: obj

Execution flow in MVC

人盡茶涼 提交于 2019-11-28 06:31:41
I am trying to learn MVC in detail, and I am wondering what's the exact functional flow internally, in the sense of which functions (important functions) are called and what they do when the application starts and what functions are called apart from the controller actions that we write in our application as we proceed. Eilon Here are the detailed steps: Request comes into ASP.NET ASP.NET Routing finds the route match by calling RouteCollection.GetRouteData This in turn calls RouteBase.GetRouteData on each route until it finds a match The IRouteHandler for the matching route has its

How to exit an if clause

与世无争的帅哥 提交于 2019-11-27 19:52:01
问题 What sorts of methods exist for prematurely exiting an if clause? There are times when I'm writing code and want to put a break statement inside of an if clause, only to remember that those can only be used for loops. Lets take the following code as an example: if some_condition: ... if condition_a: # do something # and then exit the outer if block ... if condition_b: # do something # and then exit the outer if block # more code here I can think of one way to do this: assuming the exit cases

Why use a for loop instead of a while loop? [duplicate]

六眼飞鱼酱① 提交于 2019-11-27 17:56:27
Possible Duplicates: Iterate with for loop or while loop? Loops in C - for() or while() - which is BEST? When should one use a for loop instead of a while loop? I think the following loops are identical, except for their syntax. If so, then why choose one over the other? int i; for (i = 0; i < arr.length; i++) { // do work } int i = 0; while (i < arr.length) { // do work i++; } jjnguy In your case, you don't gain much besides one less line of code in the for loop. However, if you declare the loop like so: for(int i = 0; i < x; i++) You manage to keep i within the scope of the loop, instead of

Live javascript debugging by recording function calls and parameters [duplicate]

半城伤御伤魂 提交于 2019-11-27 14:57:18
问题 This question already has answers here : Can I override the Javascript Function object to log all function calls? (6 answers) Closed 2 years ago . Is there a debugging system that allows me to record javascript function calls and their parameters as they occur? this would allow me to trace and debug applications in live/client situations without the performance hit due to manual logging. Edit: I'm not talking about manually calling functions using a 'console' window and viewing the results,

How to print the next N executed lines automatically in GDB?

倾然丶 夕夏残阳落幕 提交于 2019-11-27 03:25:55
I have been trying to find a way for some time to automate the progress in GDB of tracing the control flow of a program. Even just a simple way of automating the n command so you can see in what order routines are called. I realise that you can issues n x where x is the number of times GDB steps through, but the trouble with that is that it shows the command but not the address of the routine! But if you press n manually in GDB (then press return to issue the previous command) it shows the address. I have tried the following in GDB: (after setting a breakpoint at say 0x0123456) b *0x0123456