comparison

问题 This question already has answers here : Location of parenthesis for auto-executing anonymous JavaScript functions? (4 answers) Closed 4 years ago . I know this is silly, but there's any difference between this: (function() { var foo = 'bar'; })(); and this? (function() { var foo = 'bar'; }()); JSLint tells us to Move the invocation into the parens that contain the function , but I see no need to. Edit: The answers are too cool. ~function , the JSHint alternative along with jQuery's

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 years ago . After searching through some existing libraries for JSON, I have finally ended up with these two: Jackson Google GSon I am a bit partial towards GSON, but word on the net is that GSon suffers from a certain celestial performance issue (as of Sept 2009). I am continuing my

问题 What is the difference between == and === ? How exactly does the loosely == comparison work? How exactly does the strict === comparison work? What would be some useful examples? 回答1: Difference between == and === The difference between the loosely == equal operator and the strict === identical operator is exactly explained in the manual: Comparison Operators ┌──────────┬───────────┬───────────────────────────────────────────────────────────┐ │ Example │ Name │ Result │ ├──────────┼───────────

问题 What would be the best means of going about this without explicit comparison? 回答1: If List Of Object contains Strings , You need to Add them to Set . If the list contains Custom object , override equals meth in the custom class and those object to Set 回答2: - Use Collection named Set , which maintains Uniqueness. - Use asList() method of Array to convert it into List , and then use addAll() method to add the List to the Set . - Adding List to the Set will remove the duplicates . Eg: String[]

问题 I just wrote a simple python command to check on a big list from a csv file. The csv has 2 columns with 10K lines. when I input the 2nd row into a list and later print the list, it takes the IDLE quite some time to show it where the terminal (under mac) shows it promptly. *BTW, I checked it on 2 different machines - same result. Obviously, no one will print 10k items on a console but the idea that one is significantly faster than the other makes me wonder: why IDLE which supposed to be python

问题 I am building some test code and I try to compare pointers with the < , > operators. My goal is to order elements into a balanced tree structure (implemented by me). For that, I need quick, generic comparation. Following the good old C/C++ customs, my current idea is ( ...was, at the time of writing this post ) to compare them by their pointer addresses. However, as I've found, it doesn't work. The source if (&(a.val) < &(b.val)) { gives the compile error ./pointer.go:40: invalid operation:

问题 I am currently working on a python project and stuck in one little problem related to comparison of two XML files using python. Now for instance assume that we have two xml files: A file: <m1:time timeinterval="5"> <m1:vehicle distance="40" speed="5"\> <m1:location hours = "1" path = '1'\> <m1:feature color="2" type="a">564</m1:feature> <m1:feature color="3" type="b">570</m1:feature> <m1:feature color="4" type="c">570</m1:feature> <\m1:location> <m1:location hours = "5" path = '1'\> <m1

问题 I am trying to compare cell A1 with B1 and if it is true populate cell F1 with the A1 value. But irrespective of my input values the if condition becomes true. Sub Macro3() Dim i As Integer i = 1 For i = 1 To 10 If (Range("A" & i).Select = Range("B" & i).Select) Then Range("A" & i).Select Selection.Copy Range("F" & i).Select ActiveSheet.Paste End If Next i End Sub 回答1: Instead of selecting, copying, and pasting, you can compare the Value property of the cells, then set the F column Value

问题 I need a way to compare two files that have the same hostname in them. I have written a function that will parse out the hostnames and save that in a list. Once I have that I need to be able to compare the files. Each file is in a different directory. Step One: Retrieve "hostname" from each file. Step Two: Run compare on files with same "hostname" from two directories. Retrieve hostname Code: def hostname_parse(directory): results = [] try: for filename in os.listdir(directory): if filename

问题 The reason behind the question For a physics-project, we want to analyze two surfaces (specified by a bunch of vertices) and calculate the volume between those surfaces. To be able to do this, we want to implement a two-dimensional interval-search tree. In total the asymptotic run time, will be close to O(n 2 log n). The question In summary we are going to implement an algorithm, which will be quite time-expensive. Furthermore, the algorithm doesn't profit from the highly optimized math