// @dynamic
// The island-backed string surface: case mapping, split into a STATIC
// string[] flowing into intrinsic array ops, padding, string-pattern
// replacement, trimming, and in-range at().
const s = "  Hello, World  ";
console.log(s.toUpperCase() + "|", s.toLowerCase() + "|");
console.log(s.trimStart() + "|", s.trimEnd() + "|", s.trim().length);
const csv = "a,b,c,d";
const parts = csv.split(",");
console.log(parts.length, parts.indexOf("c"), parts.includes("e"), parts.join("-"));
console.log("one".split(",").length, "one".split(",")[0], "".split(",").length);
console.log("5".padStart(3, "0"), "5".padEnd(3, "0"), "abcdef".padStart(3, "x"));
console.log("v".padStart(6, "ab"), "v".padEnd(6, "ab"));
console.log("banana".replace("an", "AN"), "banana".replaceAll("an", "AN"));
console.log("banana".replaceAll("na", ""), "aaa".replace("", "b"), "aaa".replaceAll("x", "y"));
console.log("hello".at(0), "hello".at(4), "hello".at(-1), "hello".at(-5));
// Chains across the static and island halves keep their static types.
const words = "mixed case words".toUpperCase().split(" ");
console.log(words.length, words[0], words.join("_").padEnd(20, "!"));
console.log(words[1].toLowerCase().repeat(2).indexOf("sec"));