课程: JavaScript: Maps and Sets

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Does Set have your value?

Does Set have your value? - JavaScript教程

课程: JavaScript: Maps and Sets

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Does Set have your value?

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- [Instructor] Depending on what you're working on, you may simply need to check whether or not a value exists in your Set. This is where the Has Method can be very helpful. It's usage is identical to that in Maps and WeakMap. The Has Method is applied to your existing Set, passing the value that you're checking for in the Set. If the Set has the value, true will be returned, if not, false will be returned, pretty straightforward, right. Now let's move to our birthday invitations example and see how this might work in a real world example. In this example, we want to see if Sue and Sally are included in our invite Set. First, we will check to see if Sue exists in our Set. She does, so the return value is true. In the second example we want to see if Sally exists in the set and she does not, so false is returned. All right, let's head to our editor and try an example together. Similar to how we did with Map, we're going…

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