jpitchardu

func ConnectToDB() result.Result[sql.DB] {
	psqlInfo := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable", host, port, user, password, dbname)

	return result.NewResult(sql.Open("postgres", psqlInfo)).Try(func(db *sql.DB) error {
		return db.Ping()
	}).IfOk(func() {
		fmt.Println("Successfully connected to database!")
	})
}

jpitchardu

obj?.arrayProp?[0]?.someProp?.someFunc?.();

jpitchardu

function optional(obj, evalFunc, def) {
  const handler = {
    get: function(target, prop, receiver) {
      const res = Reflect.get(...arguments);
      return typeof res === "object" ? proxify(res) : res != null ? res : def;
    }
  };
  const proxify = target => {
    return new Proxy(target, handler);
  };

jpitchardu

var object = { 'a': [{ 'b': { 'c': 3 } }] };
 
_.get(object, 'a[0].b.c'); // => 3
 
_.get(object, ['a', '0', 'b', 'c']); // => 3
 
_.get(object, 'a.b.c', 'default'); // => 'default'

jpitchardu

function optionalAccess(obj, path, def) {
  const propNames = path.replace(/\]|\)/, "").split(/\.|\[|\(/);
  return propNames.reduce((acc, prop) => acc[prop] || def, obj);
}

const obj = {
  items: [
    { hello: "Hello" }
  ]
};

jpitchardu

function optionalAccess(obj, path, def) {
  const propNames = path.replace(/\]|\)/, "").split(/\.|\[|\(/);
  return propNames.reduce((acc, prop) => acc[prop] || def, obj);
}

const obj = {
  items: [
    { hello: "Hello" }
  ]
};

jpitchardu

console.log( obj && obj.prop1 && obj.prop1.prop2 && obj.prop1.prop2.prop3 ); // => undefined

jpitchardu

let obj;

console.log(obj && obj.someProp); // Prints undefined

jpitchardu

let obj;
console.log(obj.someProp); // => TypeError: Cannot read property 'someProp' of undefined

obj = null;
console.log(obj.someProp); // => TypeError: Cannot read property 'someProp' of null

jpitchardu

SomeClass obj;

obj?.prop1?.prop2?.prop3 ?? "SomeDefaultValue";