24 lines
664 B
Markdown
24 lines
664 B
Markdown
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---
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title: Use Closure to Protect Properties Within an Object from Being Modified Externally
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---
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## Use Closure to Protect Properties Within an Object from Being Modified Externally
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### Method
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Just like in the example given, rather than declaring the `weight` variable with the `this` keyword, the `let` keyword must be used to declare it as a private variable. This way it can only be accessed inside the `Bird` function. The `getWeight` method must then be added inside the `Bird` function to access the `weight` variable.
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### Solution
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```javascript
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function Bird() {
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let weight = 15;
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this.getWeight = function() {
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return weight;
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};
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}
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```
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