function StringBuilder() {
this._buffer = [];
}
StringBuilder.prototype = {
constructor: StringBuilder,
add: function (str) {
this._buffer.push(str);
},
toString: function () {
return this._buffer.join('');
}
};
For most non-security-critical applications, privacy is more like a hint to clients of an
API: “You don’t need to see this.” That’s the key benefit of encapsulation—hiding complexity. Even though more is going on under the hood, you only need to understand
the public part of an API. The idea of a naming convention is to let clients know about privacy by marking the key of a property. A prefixed underscore is often used for this
purpose.
Let’s rewrite the previous StringBuilder example so that the buffer is kept in a property
_buffer, which is private, but by convention only:
API: “You don’t need to see this.” That’s the key benefit of encapsulation—hiding complexity. Even though more is going on under the hood, you only need to understand
the public part of an API. The idea of a naming convention is to let clients know about privacy by marking the key of a property. A prefixed underscore is often used for this
purpose.
Let’s rewrite the previous StringBuilder example so that the buffer is kept in a property
_buffer, which is private, but by convention only:
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