Strangely enough, nobody pointed out how to calculate how many bytes is taking one Unicode char. Here is the rule for UTF-8 encoded strings: Binary Hex Comments 0xxxxxxx 0x00..0x7F Only byte of a 1-byte character encoding 10xxxxxx 0x80..0xBF Continuation byte: one of 1-3 bytes following the first 110xxxxx 0xC0..0xDF First byte of a 2-byte character … Read more
Converting to either upper case or lower case in order to do case-insensitive comparisons is incorrect due to “interesting” features of some cultures, particularly Turkey. Instead, use a StringComparer with the appropriate options. MSDN has some great guidelines on string handling. You might also want to check that your code passes the Turkey test. EDIT: … Read more
import re s=”asdf=5;iwantthis123jasd” result = re.search(‘asdf=5;(.*)123jasd’, s) print(result.group(1))
You can use Parameter Expansion to do this. If a is constant, the following parameter expansion performs substring extraction: b=${a:12:5} where 12 is the offset (zero-based) and 5 is the length If the underscores around the digits are the only ones in the input, you can strip off the prefix and suffix (respectively) in two … Read more
String is the dynamic heap string type, like Vec: use it when you need to own or modify your string data. str is an immutable1 sequence of UTF-8 bytes of dynamic length somewhere in memory. Since the size is unknown, one can only handle it behind a pointer. This means that str most commonly2 appears … Read more
Answer recommended by Go Language
Converting Int to String: let x : Int = 42 var myString = String(x) And the other way around – converting String to Int: let myString : String = “42” let x: Int? = myString.toInt() if (x != nil) { // Successfully converted String to Int } Or if you’re using Swift 2 or 3: … Read more
You can use ${!a}: var1=”this is the real value” a=”var1″ echo “${!a}” # outputs ‘this is the real value’ This is an example of indirect parameter expansion: The basic form of parameter expansion is ${parameter}. The value of parameter is substituted. If the first character of parameter is an exclamation point (!), it introduces a … Read more
Welcome to Dart. What you are experience is the new null-safety feature (introduced with Dart 2.12.0) where variables by default cannot contain the value null. This is statically checked so you will get an error even before your program are executed. In your example the problem is the following line: var input = stdin.readLineSync(); If … Read more
Assuming you want a field length of 2 with leading zeros you’d do this: import Foundation for myInt in 1 … 3 { print(String(format: “%02d”, myInt)) } output: 01 02 03 This requires import Foundation so technically it is not a part of the Swift language but a capability provided by the Foundation framework. Note … Read more