When you enclose a variable name in a double-quoted string it will be replaced by that variable’s value: $foo = 2 “$foo” becomes “2” If you don’t want that you have to use single quotes: $foo = 2 ‘$foo’ However, if you want to access properties, or use indexes on variables in a double-quoted string, … Read more
Just double it scala> val name = “foo” name: String = foo scala> s”my.package.$name$$” res0: String = my.package.foo$
Looking, it turns out on my system there is an envsubst command which is part of the gettext-base package. So, this makes it easy: envsubst < “source.txt” > “destination.txt” Note if you want to use the same file for both, you’ll have to use something like moreutil’s sponge, as suggested by Johnny Utahh: envsubst < … Read more
Noticable is relative. However: string interpolation is turned into string.Format() at compile-time so they should end up with the same result. There are subtle differences though: as we can tell from this question, string concatenation in the format specifier results in an additional string.Concat() call.
Here’s a complete “Ideal 2”. It’s not an f-string—it doesn’t even use f-strings—but it does as requested. Syntax exactly as specified. No security headaches since we are not using eval(). It uses a little class and implements __str__ which is automatically called by print. To escape the limited scope of the class we use the … Read more
You can apply both $ and @ prefixes to the same string: string s = $@”Result… Adding “”{x}”” and {this.Y()} to foobar: {x.GetLog()}”; Since being introduced in C# 6, interpolated verbatim strings had to start with the tokens $@, but starting with C# 8, you can use either $@ or @$.
If you’re using Java 5 or higher, you can use String.format: urlString += String.format(“u1=%s;u2=%s;u3=%s;u4=%s;”, u1, u2, u3, u4); See Formatter for details.
In JavaScript you can use template literals: Template literals are literals delimited with backticks (`) let value = 100; console.log(`The size is ${ value }`);
Python 3.6 will add literal string interpolation similar to Ruby’s string interpolation. Starting with that version of Python (which is scheduled to be released by the end of 2016), you will be able to include expressions in “f-strings”, e.g. name = “Spongebob Squarepants” print(f”Who lives in a Pineapple under the sea? {name}.”) Prior to 3.6, … Read more
Only double quoted strings interpret the escape sequences \r and \n as ‘0x0D’ and ‘0x0A’ respectively, so you want: “\r\n” Single quoted strings, on the other hand, only know the escape sequences \\ and \’. So unless you concatenate the single quoted string with a line break generated elsewhere (e. g., using double quoted string … Read more