conditional

问题 I was encountering a lot of bugs in my code because I expected this expression: Boolean([]); to evaluate to false. But this wasn't the case as it evaluated to true. Therefore, functions that possibly returned [] like this: // Where myCollection possibly returned [ obj1, obj2, obj3] or [] if(myCollection) { // ... }else { // ... } did not do expected things. Am I mistaken in assuming that [] an empty array? Also, Is this behavior consistent in all browsers? Or are there any gotchas there too?

问题 Does anyone know why this code might not work? touchmove and touchend do not execute only touchstart because that's a seperate event and function :) $('input').live("touchstart", function (e) {$(this).addClass('click')}); $('input').live("touchmove,touchend", function (e) { if (e.type == 'touchmove'){ $('.temp').removeClass('temp'); $('.click').removeClass('click'); } else{var inputvalue = $(this).val() $('input[value="' + inputvalue + '"] + label').css({ '-webkit-transition': 'opacity 0.3s

问题 I have Column A : str 11/9/2007 end 10/10/2008 str 11/14/2008 end 5/29/2009 str 11/27/2009 end 2/5/2010 str 10/8/2010 end 4/8/2011 str 4/29/2011 end 5/20/2011 str 7/8/2011 end 10/21/2011 and Column B : 9/6/2007 9/7/2007 9/10/2007 9/11/2007 9/12/2007 9/13/2007 9/14/2007 9/17/2007 9/18/2007 9/19/2007 9/20/2007 9/21/2007 9/24/2007 9/25/2007 9/26/2007 9/27/2007 9/28/2007 10/1/2007 10/2/2007 10/3/2007 10/4/2007 10/5/2007 10/8/2007 10/9/2007 10/10/2007 10/11/2007 10/12/2007 10/15/2007 10/16/2007 I

问题 How can I Lock/Unlock a cell(A1) based on value(yes/no) in another cell(A2) using conditional formatting? 回答1: There's lots of resources online showing how to do this. Here's an article that helped explain it to me: http://database.ittoolbox.com/groups/technical-functional/excel-l/how-to-lockunlock-an-excel-cell-based-on-the-contents-of-another-cell-4625040 In case that link dies, here is the gist of it: To do what you are describing, you will need to create an event procedure that Excel will

问题 I am quite new to using SAS and would like to ask for your help on merging two datasets that do not contain one key identifier but require a combination of three conditions to be merged successfully. I have two datasets: Dataset 1 contains information on client visits including StartDate , EndDate , EmployeeNumber and CustomerNumber . Dataset 2 contains information on certain activities that may have been performed during the visits in addition to the "Date" when the activity has been carried

问题 I have a question related to a transition in my statechart (see image above). I have a variable called palletInUse which is a boolean-type and changes between true and false. For one transition in my statechart I want it to change when the variable palletInUse has the value true. I have tried it with for example: palletInUse == true; and also tried different code like, equals and contentEquals etc. but nothing seems to work. Do you have a solution for this, seemingly simple problem? Thanks in

问题 I have date objects formatted like 2011/06/13 17:52:20 and being returned as strings. How would I compare this against another date formatted the same way. I want to determine which one is greater than, less than or equal to, for a conditional statement I am forming. Without reinventing the wheel (or making several cases) when there might already be a framework for doing this Thanks! 回答1: use SimpleDateFormat to parse use compareTo(..) of the Date objects that are obtained For example:

问题 I Have DF1: c01 p01 c02 p02 c03 p03 c04 p04 1 0 1 20 1 33 1 49 2 3 2 21 2 34 2 50 3 4 3 21 3 38 3 50 4 6 4 23 4 40 4 51 5 7 5 24 5 41 5 53 6 9 6 27 6 41 6 54 7 11 7 29 7 41 7 55 8 15 8 31 8 43 8 57 9 15 9 33 9 47 9 57 10 16 10 33 10 49 10 60 And i Have DF2: type round A 1 B 1 A 2 B 2 A 3 B 3 A 4 B 4 What i want is to generate a new variable in DF2 that goes like: DF2$g1<- if(DF2$round==1, 0) DF2$g2<- if(c01==4 & round==1,DF2$p01) DF2$g3<- if(c01==4 & round==2,DF2$p02) DF2$g4<- if(c01==4 &

问题 Inside a SELECT statement, is it possible to GROUP BY col_A if col_B = "some_value" , otherwise GROUP BY col_C ? Then have that field that was used for grouping inside the results? Like SELECT value_of_the_column_used_for_group FROM table WHERE ... GROUP BY (IF col_B = "some_value" : col_A : ELSE : col_C) LIMIT 0, 20; Basically I want to select children records that have distinct parents or parent records that have distinct IDs. But I want to select parent IDs, which can be the ID column or

问题 Inside a SELECT statement, is it possible to GROUP BY col_A if col_B = "some_value" , otherwise GROUP BY col_C ? Then have that field that was used for grouping inside the results? Like SELECT value_of_the_column_used_for_group FROM table WHERE ... GROUP BY (IF col_B = "some_value" : col_A : ELSE : col_C) LIMIT 0, 20; Basically I want to select children records that have distinct parents or parent records that have distinct IDs. But I want to select parent IDs, which can be the ID column or