With Apache Commons Lang 3.5 and above: NumberUtils.isCreatable or StringUtils.isNumeric. With Apache Commons Lang 3.4 and below: NumberUtils.isNumber or StringUtils.isNumeric. You can also use StringUtils.isNumericSpace which returns true for empty strings and ignores internal spaces in the string. Another way is to use NumberUtils.isParsable which basically checks the number is parsable according to Java. (The … Read more
You should check your field before parse double:
Decode it. To get bytes from string, encode it.
Compression algorithms almost always have some form of space overhead, which means that they are only effective when compressing data which is sufficiently large that the overhead is smaller than the amount of saved space. Compressing a string which is only 20 characters long is not too easy, and it is not always possible. If … Read more
A std::map<std::string, MyEnum> (or unordered_map) could do it easily. Populating the map would be just as tedious as the switch statement though. Edit: Since C++11, populating is trivial:
I got a string and I want to remove all the punctuations from it. How do I do that? I did some research and found that people use the ispunct() function (I tried that), but I cant seem to get it to work in my code. Anyone got any ideas?
I have updated this answer. I like the idea of using a match better, but it is slower: Expand snippet Use a regular expression literal if you know what you are searching for beforehand, if not you can use the RegExp constructor, and pass in the g flag as an argument. match returns null with … Read more
Mark’s iterative approach would be the usual way, I think. Here’s an alternative with string-splitting, which can often be useful for finding-related processes: And here’s a quick (and somewhat dirty, in that you have to choose some chaff that can’t match the needle) one-liner:
Well, you could erase() the first character too (note that erase() modifies the string): But in this case, a simpler way is to take a substring: Be careful to validate that the string actually has at least two characters in it first…
try: you were trying to apply .lower() to data, which is a list..lower() can only be applied to strings.