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Which equals operator (== vs ===) should be used in JavaScript comparisons?
...cally to the abstract equality operator (==) except no type conversion is done, and the types must be the same to be considered equal.
Reference: Javascript Tutorial: Comparison Operators
The == operator will compare for equality after doing any necessary type conversions. The === operator will n...
Why can't yield return appear inside a try block with a catch?
...e language with a 99.9% accurate compiler (yes, there are bugs; I ran into one on SO just the other day) than a more flexible language which couldn't compile correctly.
EDIT: Here's a pseudo-proof of how it why it's feasible.
Consider that:
You can make sure that the yield return part itself doe...
UnicodeDecodeError when redirecting to file
...n the following two points:
Characters are mostly unrelated to computers: one can draw them on a chalk board, etc., like for instance بايثون, 中蟒 and ????. "Characters" for machines also include "drawing instructions" like for example spaces, carriage return, instructions to set the writi...
Java: Integer equals vs. ==
...@Thilo True, always use equals() when dealing with objects. This should be one of the first things one should know when learning Java. By the way, I would have guessed that the constructor of Integer was private, i.e. that instances were always created through the valueOf() method. But I see that th...
Convert form data to JavaScript object with jQuery
...a few months old, but since when did do arrays use non-numeric indexes? No one should name an input foo[bar] and hope to treat it as an array. Are you confusing arrays and hashes? Yes, [] is commonly understood to be an accessor but not just for arrays. Also saying it's valid HTML but not in the HTM...
Rails: How to change the title of a page?
... (as others have already suggested). However, in simple cases such as this one I like to put the necessary code directly into the specific views without custom helpers.
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Differences between MySQL and SQL Server [closed]
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One thing you have to watch out for is the fairly severe differences in the way SQL Server and MySQL implement the SQL syntax.
Here's a nice Comparison of Different SQL Implementations.
For example, take a look at the top-...
How to use multiple AWS Accounts from the command line?
I've got two different apps that I am hosting (well the second one is about to go up) on Amazon EC2.
7 Answers
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Find the index of a dict within a list, by matching the dict's value
...ex = next((index for (index, d) in enumerate(lst) if d["name"] == "Tom"), None)
# 1
If you need to fetch repeatedly from name, you should index them by name (using a dictionary), this way get operations would be O(1) time. An idea:
def build_dict(seq, key):
return dict((d[key], dict(d, index=...
What are the differences between Perl, Python, AWK and sed? [closed]
...tended Regular Expressions). The language for the actions is similar to C. One of the key features of awk is that it splits the input automatically into records and each record into fields.
Perl was written in part as an awk-killer and sed-killer. Two of the programs provided with it are a2p and s2...