builtin(str): add withPrefix

Closes #4142

Signed-off-by: Prajwal S N <prajwalnadig21@gmail.com>
This commit is contained in:
Prajwal S N 2022-10-08 12:52:10 +05:30
parent f0786121fb
commit d6526fa425
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3 changed files with 30 additions and 0 deletions

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@ -1930,3 +1930,27 @@ fn when_on_strings() {
i64
);
}
#[test]
#[cfg(any(feature = "gen-llvm", feature = "gen-wasm"))]
fn str_with_prefix() {
assert_evals_to!(
indoc!(
r#"
Str.withPrefix "world!" "Hello "
"#
),
RocStr::from("Hello world!"),
RocStr
);
assert_evals_to!(
indoc!(
r#"
"two" |> Str.withPrefix "Forty "
"#
),
RocStr::from("Forty two"),
RocStr
);
}