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All right.

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We can remove the item.

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Now let's see how we can increase the amount and for increased demand we're going to start by assigning

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to a variable so we can say cost.

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I'm gonna call this new card and then again we're gonna spread out our card values then we're gonna

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run map methadone them.

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So we have the array so we can run the math method and then I would like to access each and every item

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and not set up functionality what we would want to do.

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So I would want to check whether the I.D. that I'm getting from the increased amount matches that of

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the item.

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Again we're just iterating over the array and then we're just checking if the I.D. matches that of the

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item I.D. even the item I.D. matches.

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Then we're going to update the amount property on that item if the item does not have the same I.D.

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then we're just gonna return whatever properties the item has.

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So the way is going to look like when I say return item I.D. equals to Eddie.

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So this is the place where we're checking and then we're saying if it matches if the matches then spread

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out all the properties that item has and then if you'd want to update one of the properties we just

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need to rewrite it.

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So we have item and then we're overriding the amount so amount is already returned.

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Since we're spreading out the properties but then we can override that and we can say that the amount

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right now is gonna be equal to our item amount and then plus one since.

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Of course we are adding one item notice.

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Again we are spreading out all the properties that item has starting from the 80s and all the way to

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image and then since we would like to override the amount property that's where we set up a month.

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So that's gonna be the new value then we're grabbing the old value.

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So Item Amount.

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And then we're just adding 1 that is of course because we are increasing the amount.

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Now if the item I.D. does not match then we can just say spread out all the properties that itemize.

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And essentially we're just gonna get a new card that will have one of the items with increased value

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and then eventually we're just gonna have a set card said card and we're gonna pass in the new card

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again.

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I could have written this.

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Of course even shorter could have set up the functionally right here within a set card but I didn't

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want to confuse you too much.

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That's the reason why we set up a separate new card variable.

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We're almost done.

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We just need to head over to card item then like we had with remove item we're going to have increase

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crease increase amount amount and then of course we would want to run it.

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So when we have the angle up means increasing.

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So let's run increase amount.

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And then again let's pass in the idea that each and every card item has and let's say we can add over

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and we're going to try to increase this guy.

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And sure enough we do.

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And also notice how each and every time we update the state value or total also changes in the same

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work would remove if we remove the item we right away are calculating the values.

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And since I can see that my functionality works now we can head over and start working on the decreased

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amount.