Source code
Revision control
Copy as Markdown
Other Tools
// |str.slice(-1)| and |str.substr(-1)| are compiled as |str.at(str.length - 1)|.
const strings = [
"",
"a", "b",
"ab", "ba",
];
for (let i = 0; i < 1000; ++i) {
let str = strings[i % strings.length];
assertEq(str.slice(-1), str.charAt(str.length - 1));
assertEq(str.substr(-1), str.charAt(str.length - 1));
}