Function examples
| Example | Result |
|---|---|
| Contains("test", "es") | true |
| Count("test", "t") | 2 |
| HasPrefix("test", "te") | true |
| HasSuffix("test", "st") | true |
| Index("test", "e") | 1 |
| Join([]string{"a", "b"}, "-") | a-b |
| Repeat("a", 5) | aaaaa |
| Replace("foo", "o", "0", -1) | f00 |
| Replace("foo", "o", "0", 1) | f0o |
| Split("a-b-c-d-e", "-") | [a b c d e] |
| ToLower("TEST") | test |
| ToUpper("test") | TEST |
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