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proxy api javascript set

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

answer proxy api javascript set

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proxy api javascript set

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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 javascript proxy set

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Contributed on Nov 08 2021

Fair Fish

0 Answers Avg Quality 2/10

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proxy api javascript get

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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

Link to this answer
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Contributed on Nov 08 2021

Fair Fish

0 Answers Avg Quality 2/10

proxy api javascript set

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proxy api javascript set

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proxy api javascript get

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