课程: JavaScript: Maps and Sets

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Solution: Maps 2

Solution: Maps 2 - JavaScript教程

课程: JavaScript: Maps and Sets

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Solution: Maps 2

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(light upbeat music) - [Instructor] In this next challenge, we want to determine if a map has the key of Brandon. So if we look in our test code, we can see that the map has actually been set up for us. So that step has been removed. We just need to see at this point, does that map contain a specific key? So let's go ahead and write out our return statement. And then we need to reference the allUsers map. And we're going to be using the method has to determine if that key exists. And the key that we're looking for is Brandon. I'll mention this in several different videos and lessons, but when it comes to strings in JavaScript, it's really important that the case matches. So it's going to be looking for an exact match for Brandon. If we were looking for Alice, if we passed a lowercase A instead of capital A, it would return false for us. So it's really important to make sure that the casing matches. So here we have, we're returning allUsers, which is our map, and we're checking to see,…

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