Warning: Although String.prototype.substr (…) is not strictly deprecated (as in “removed from the Web standards”), it is considered a legacy function and should be avoided when possible. It is not ...

Many developers assume slice() and substring() in JavaScript are interchangeable. They’re not. While both extract parts of a string, their edge-case behavior is very different - and misunderstanding ...

The slice() method of {{jsxref("String")}} values extracts a section of this string and returns it as a new string, without modifying the original string.