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Merge pull request #290 from justin0022/patch-2

Update README.md

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Original file line number	Diff line number	Diff line change
@@ -650,7 +650,7 @@ then any other function that uses that `cart` array will be affected by this
`650`	`650`	`addition. That may be great, however it can be bad too. Let's imagine a bad`
`651`	`651`	`situation:`
`652`	`652`
`653`		-The user clicks the "Purchase", button which calls a `purchase` function that
	`653`	+The user clicks the "Purchase" button which calls a `purchase` function that
`654`	`654`	spawns a network request and sends the `cart` array to the server. Because
`655`	`655`	of a bad network connection, the `purchase` function has to keep retrying the
`656`	`656`	`request. Now, what if in the meantime the user accidentally clicks "Add to Cart"`

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