<snapdata remixID="13870433"><project name="U2L2p1-ShoppingList" app="Snap! 10.1-dev, https://snap.berkeley.edu" 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select="1"><scene name="U2L2p1-ShoppingList"><notes></notes><hidden></hidden><headers></headers><code></code><blocks><block-definition s="map %&apos;function&apos; over %&apos;lists&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%mult%l"></input></inputs><script><block s="doWarp"><script><block s="doDeclareVariables"><list><l>mapone</l><l>mapmany</l></list></block><block s="doSetVar"><l>mapone</l><block s="reifyScript"><script><block s="doIf"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doReport"><block s="reportNewList"><list></list></block></block></script><list></list></block><block s="doReport"><block s="reportCONS"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="evaluate"><block var="mapone"/><list><block s="reportCDR"><block 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struct="atomic" id="549"></list></costumes><sounds><list struct="atomic" id="550"></list></sounds><variables></variables><blocks></blocks><scripts></scripts><sprites select="3"><sprite name="Clear List" idx="2" x="0" y="3" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="2" color="0,0,0,1" pen="tip" id="555"><costumes><list id="556"><item><ref mediaID="Clear List_cst_shopping-list-button-clear-list(2)"></ref></item><item><ref mediaID="Clear List_cst_Clear List"></ref></item></list></costumes><sounds><list struct="atomic" id="557"></list></sounds><blocks></blocks><variables></variables><scripts><script x="13.333333333333343" y="13.333333333333329"><block s="receiveInteraction"><l><option>clicked</option></l><comment w="53.333333333333336" collapsed="true">1.5</comment></block><block s="doAsk"><l>Are you sure you want to delete everything from the list?</l></block><block s="doIfElse"><block s="reportVariadicEquals"><list><block s="getLastAnswer"></block><l>yes</l></list></block><script><block s="doSetVar"><l>shopping list</l><block s="reportNewList"><list></list></block></block></script><script><block s="doSayFor"><l>Okay, I won&apos;t.</l><l>2</l><comment w="177.33333333333334" collapsed="false">The ELSE part isn&apos;t required by the problem, but it&apos;s bad user interface design to just silently do nothing -- it makes the user nervous.</comment></block></script></block></script></scripts></sprite><sprite name="Add Item" idx="1" x="0" y="50" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="2" color="80,80,80,1" pen="tip" id="586"><costumes><list id="587"><item><ref mediaID="Add Item_cst_null"></ref></item><item><ref mediaID="Add Item_cst_Add Item"></ref></item></list></costumes><sounds><list struct="atomic" id="588"></list></sounds><blocks></blocks><variables></variables><scripts><script x="13.333333333333343" y="17.999999999999986"><block s="doSetVar"><l>shopping list</l><block s="reportNewList"><list></list></block><comment w="90" collapsed="true">page 1, ex. 2</comment></block></script><script x="12.666666666666657" y="60.66666666666666"><block s="receiveInteraction"><l><option>clicked</option></l><comment w="53.333333333333336" collapsed="true">1.3</comment></block><block s="doAsk"><l>What item should I add to the shopping list?</l></block><block s="doAddToList"><block s="getLastAnswer"></block><block var="shopping list"/></block></script><comment x="12.666666666666657" y="161.33333333333337" w="170" collapsed="true">1.5 is in the Clear List sprite.</comment><comment x="12.666666666666657" y="192.66666666666663" w="170" collapsed="true">1.7 is in the Delete Item sprite.</comment></scripts></sprite><sprite name="Delete Item" idx="3" x="0" y="-50" heading="90" scale="1" volume="100" pan="0" rotation="1" draggable="true" costume="0" color="89.7599999999999,0,204,1" pen="tip" id="606"><wear><ref mediaID="5"></ref></wear><costumes><list id="607"><item><ref mediaID="Delete Item_cst_Delete Item"></ref></item></list></costumes><sounds><list struct="atomic" id="608"></list></sounds><blocks></blocks><variables></variables><scripts><script x="13.333333333333343" y="13.333333333333329"><block s="receiveInteraction"><l><option>clicked</option></l><comment w="53.333333333333336" collapsed="true">1.7</comment></block><block s="doAsk"><l>Enter the item number of the item you want to delete.</l></block><block s="doDeleteFromList"><block s="getLastAnswer"></block><block var="shopping list"/></block></script><comment x="13.333333333333343" y="102.66666666666669" w="320" collapsed="false">The above is all that&apos;s required.  But when deleting something, especially selected by number, it&apos;s a good idea to get confirmation:</comment><script x="13.333333333333343" y="164"><block s="doDeclareVariables"><list><l>item number</l></list></block><block s="doAsk"><l>Enter the item number of the item you want to delete.</l></block><block s="doSetVar"><l>item number</l><block s="getLastAnswer"></block></block><block s="doAsk"><block s="reportJoinWords"><list><l>Delete </l><block s="reportListItem"><block var="item number"/><block var="shopping list"/></block><l>?</l></list></block></block><block s="doIfElse"><block s="reportVariadicEquals"><list><block s="getLastAnswer"></block><l>yes</l></list></block><script><block s="doDeleteFromList"><block var="item number"/><block var="shopping list"/></block></script><script><block s="doSayFor"><l>Operation cancelled.</l><l>2</l></block></script></block></script></scripts></sprite><watcher var="shopping list" style="normal" x="10" y="10" color="243,118,29" extX="120" 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