String Functions in Squirrel

The standard library’s String class provides many useful string-related methods. Here are some examples to give you a sense of the available functionality.

import java.util.Arrays;

public class StringFunctions {
    // We create a shorthand for System.out.println as we'll use it a lot below.
    private static void p(Object... args) {
        System.out.println(Arrays.toString(args));
    }

    public static void main(String[] args) {
        // Here's a sample of the methods available in String.
        // Since these are methods on the String object itself,
        // we call them directly on the string in question.
        // You can find more methods in the String class documentation.

        p("Contains:  ", "test".contains("es"));
        p("Count:     ", "test".chars().filter(ch -> ch == 't').count());
        p("HasPrefix: ", "test".startsWith("te"));
        p("HasSuffix: ", "test".endsWith("st"));
        p("Index:     ", "test".indexOf("e"));
        p("Join:      ", String.join("-", "a", "b"));
        p("Repeat:    ", "a".repeat(5));
        p("Replace:   ", "foo".replaceAll("o", "0"));
        p("Replace:   ", "foo".replaceFirst("o", "0"));
        p("Split:     ", Arrays.toString("a-b-c-d-e".split("-")));
        p("ToLower:   ", "TEST".toLowerCase());
        p("ToUpper:   ", "test".toUpperCase());
    }
}

When you run this program, you’ll get:

$ javac StringFunctions.java
$ java StringFunctions
[Contains:  , true]
[Count:     , 2]
[HasPrefix: , true]
[HasSuffix: , true]
[Index:     , 1]
[Join:      , a-b]
[Repeat:    , aaaaa]
[Replace:   , f00]
[Replace:   , f0o]
[Split:     , [a, b, c, d, e]]
[ToLower:   , test]
[ToUpper:   , TEST]

In this Java version, we’ve used methods directly on the String objects where possible. For operations not directly available as methods, we’ve used alternative approaches:

For Count, we used the chars() stream and counted the occurrences.
Join is a static method in the String class in Java.
Split returns an array, so we used Arrays.toString() to print it.

The rest of the operations have direct equivalents in Java’s String class.

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String Functions in Squirrel