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
According to the language specification, you can use a raw string literal, where the string is delimited by backticks instead of double quotes. `line 1 line 2 line 3`
There is no difference, under the hood it’s all varlena (variable length array). Check this article from Depesz: http://www.depesz.com/index.php/2010/03/02/charx-vs-varcharx-vs-varchar-vs-text/ A couple of highlights: To sum it all up: char(n) – takes too much space when dealing with values shorter than n (pads them to n), and can lead to subtle errors because of adding trailing … Read more
New Way: From Go 1.10 there is a strings.Builder type, please take a look at this answer for more detail. Old Way: Use the bytes package. It has a Buffer type which implements io.Writer. package main import ( “bytes” “fmt” ) func main() { var buffer bytes.Buffer for i := 0; i < 1000; i++ … Read more
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
This snippet on the Advanced Bash Scripting Guide says: # The == comparison operator behaves differently within a double-brackets # test than within single brackets. [[ $a == z* ]] # True if $a starts with a “z” (wildcard matching). [[ $a == “z*” ]] # True if $a is equal to z* (literal matching). … Read more
Using variables in if statements if [ “$x” = “valid” ]; then echo “x has the value ‘valid'” fi If you want to do something when they don’t match, replace = with !=. You can read more about string operations and arithmetic operations in their respective documentation. Why do we use quotes around $x? You … Read more
The following is an attempt to describe the Ukkonen algorithm by first showing what it does when the string is simple (i.e. does not contain any repeated characters), and then extending it to the full algorithm. First, a few preliminary statements. What we are building, is basically like a search trie. So there is a … Read more
A simple answer is: echo ” lol ” | xargs Xargs will do the trimming for you. It’s one command/program, no parameters, returns the trimmed string, easy as that! Note: this doesn’t remove all internal spaces so “foo bar” stays the same; it does NOT become “foobar”. However, multiple spaces will be condensed to single … Read more
There are 5 6 NINE (or 63*, depending how you count) different ways to write multi-line strings in YAML. TL;DR Use > most of the time: interior line breaks are stripped out, although you get one at the end: key: > Your long string here. Use | if you want those linebreaks to be preserved … Read more