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PO
primarykey
Id
4788209
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AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
9
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CreationDate
2011-01-24T23:00:37.253
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0
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2011-01-24T23:30:37.983
LastEditDate
2011-01-24T23:30:37.983
LastEditorUserId
405143
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405143
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4788168
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
You want this instead: <pre><code>function Man(name) { Human.call(this, name, "Male"); } </code></pre> What that code does It seems like you're only trying to call the constructor of the parent, <code>Human</code>, which isn't the same is prototypal inheritance. The code above takes the constructor for <code>Human</code> and applies it to <code>this</code> - a new <code>Man</code> object. What your code does The line <code>Man.prototype = new Human(name, "Male")</code> is changing the prototype of <code>Man</code> every time a new Man is created. Not only that, you're completing re-assigning the prototype object, and so it will only apply to objects created after that assignment - i.e. not the first one. Hence, <code>m.name</code> is undefined. Proper prototypal inheritance Note that calling the parent's constructor, as in my code above, won't cause <code>Man</code> to automatically inherit any methods assigned to <code>Human.prototype</code>. The best way to do this is to clone <code>Human.prototype</code> into <code>Man.prototype</code> but outside of any constructors. Like this: <pre><code>function Man(name) { Human.call(this, name, "Male"); } function inherit(parent, child) { if (Object.create) child.prototype = Object.create(parent.prototype); else { for (var key in parent.prototype) { if (!parent.prototype.hasOwnProperty(key)) continue; child.prototype[key] = parent.prototype[key]; } } } inherit(Human, Man); </code></pre> This may seem rather verbose, and the alternative may be to do this: <pre><code>Man.prototype = new Human('no name', 'Male'); </code></pre> Which will work, but causes unwanted side-effects since we're forced to assign a dud name to the <code>prototype</code>, and it's letting the constructor for <code>Human</code> call an extra time just for assigning the prototype. Be warned if you go down this path and later change the <code>Human</code> constructor to do more than just assign properties to <code>this</code>.
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1. POJavaScript Object Inheritance - What am I doing wrong?
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1. USDavid Tang
UserOwnerUserId
1. USDavid Tang
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