.js

// 這個示例來自You Don't Know JS: https://github.com/getify/You-Dont-Know-JS/blob/2nd-ed/scope-closures/apA.md#var-and-let
function getStudents() {
    try {
        // not really a block scope
        var records = fromCache("students");
    }
    catch (err) {
        // oops, fall back to a default
        var records = [];
    }
    // ..
}