try\catch for JSON.parse

try-catch-json-parse(generic).ts

const loadDataOrDefault = <T>(response: any, defInstance?: T) => {
    try {
        return JSON.parse(response);
    } catch(e) {
        return defInstance ? defInstance : null;
    }
};

class Person {
    constructor(public name: string = "Default", public age: number = 100) {}
}

let data1 = loadDataOrDefault('undefined');
let data2 = loadDataOrDefault<Number>('undefined', 20);
let data3 = loadDataOrDefault<Person>('undefined', new Person());

console.log(data1);
console.log(data2);
console.log(data3);

try-catch-json-parse.ts

const loadDataOrDefault = (response: any, DefaultType?: any) => {
    try {
        return JSON.parse(response);
    } catch(e) {
        return DefaultType && typeof DefaultType == "function" ? new DefaultType() : null;
    }
};

class Person {
    constructor(public name: string = "Default", public age: number = 100) {}
}

let data1 = loadDataOrDefault('undefined');
let data2 = loadDataOrDefault('undefined', 20);
let data3 = loadDataOrDefault('undefined', null);
let data4 = loadDataOrDefault('undefined', Person);

console.log(data1);
console.log(data2);
console.log(data3);
console.log(data4);