// String manipulation types (runtime simulation) const t1 = "hello".toUpperCase(); const t2 = "WORLD".toLowerCase(); const t3 = "typescript".charAt(0).toUpperCase() + "typescript".slice(1); const s = "keydown"; console.log(t1); console.log(t2); console.log(t3); console.log(`on${("click").charAt(0).toUpperCase() + "click".slice(1)}`); console.log(`on${("change").charAt(0).toUpperCase() + "change".slice(1)}`); console.log(`on${(s.charAt(0).toUpperCase() + s.slice(1))}`);