等待后引发未来的TypeError

const obj = {};
if (typeof obj.someMethod === 'function') {
    obj.someMethod();
} else {
    console.error('someMethod is not a function');
}

const num = "10";
const result = Number(num) + 5; // 15

const obj = {};
if (obj.nonExistentProperty !== undefined) {
    console.log(obj.nonExistentProperty);
} else {
    console.error('nonExistentProperty is not defined');
}

const obj = {};

function safeCall(methodName) {
    if (typeof obj[methodName] === 'function') {
        return obj[methodName]();
    } else {
        console.error(`${methodName} is not a function`);
        return undefined;
    }
}

function safeAccess(property) {
    if (obj[property] !== undefined) {
        return obj[property];
    } else {
        console.error(`${property} is not defined`);
        return undefined;
    }
}

safeCall('someMethod'); // TypeError: someMethod is not a function
safeAccess('nonExistentProperty'); // nonExistentProperty is not defined