proxy api javascript get

Fair Fish answered on November 8, 2021 Popularity 10/10 Helpfulness 2/10

answer proxy api javascript get

related proxy api javascript set

proxy api javascript get

Comment

const handler = {
  get: function(obj, prop) {
    return prop in obj ?
      obj[prop] :
      37;
  }
};

const p = new Proxy({}, handler);
p.a = 1;
p.b = undefined;

console.log(p.a, p.b);
//  1, undefined

console.log('c' in p, p.c);
//  false, 37

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: api get javascript proxy

Link to this answer
Share Copy Link

Contributed on Nov 08 2021

Fair Fish

0 Answers Avg Quality 2/10

Closely Related Answers

proxy api javascript set

Comment

let validator = {
  set: function(obj, prop, value) {
    if (prop === 'age') {
      if (!Number.isInteger(value)) {
        throw new TypeError('The age is not an integer');
      }
      if (value > 200) {
        throw new RangeError('The age seems invalid');
      }
    }

    // The default behavior to store the value
    obj[prop] = value;

    // Indicate success
    return true;
  }
};

const person = new Proxy({}, validator);

person.age = 100;
console.log(person.age); // 100
person.age = 'young';    // Throws an exception
person.age = 300;        // Throws an exception

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: api

Link to this answer
Share Copy Link

Contributed on Nov 08 2021

Fair Fish

0 Answers Avg Quality 2/10

proxy api javascript get

Contents

More Related Answers

proxy api javascript get

Closely Related Answers

proxy api javascript set

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.