<snapdata remixID="14972588"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 11.0.8, https://snap.berkeley.edu" version="2"><notes></notes><thumbnail>data:image/png;base64,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</thumbnail><scenes select="1"><scene name="U3L1-ShoppingList_Empty to Students"><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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lists"/></list></custom-block></list></block></block></block></script><list><l>data lists</l></list></block></block><block s="doIfElse"><custom-block s="empty? %l"><block s="reportCDR"><block var="lists"/></block></custom-block><script><block s="doReport"><block s="evaluate"><block var="mapone"/><list><block s="reportListItem"><l>1</l><block var="lists"/></block></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="mapmany"/><list><block var="lists"/></list></block></block></script></block></script></block></script></block-definition><block-definition s="empty? %&apos;data&apos;" type="predicate" category="lists"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doReport"><block s="reportVariadicEquals"><list><block var="data"/><block s="reportNewList"><list></list></block></list></block></block></script></block-definition><block-definition s="keep items such that %&apos;pred&apos; from %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%predRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><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="doIfElse"><block s="evaluate"><block var="pred"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><script><block s="doReport"><block s="reportCONS"><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></block></script><script><block s="doReport"><custom-block s="keep items such that %predRing from %l"><block var="pred"/><block s="reportCDR"><block var="data"/></block></custom-block></block></script></block></script></block></script></block-definition><block-definition s="combine with %&apos;function&apos; items of %&apos;data&apos;" type="reporter" category="lists"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="data"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="data"/></block></block></script><list></list></block><block s="doReport"><block s="evaluate"><block var="function"/><list><block s="reportListItem"><l>1</l><block var="data"/></block><custom-block s="combine with %repRing items of %l"><block var="function"/><block s="reportCDR"><block var="data"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; then %&apos;true&apos; else %&apos;false&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%b"></input><input type="%anyUE"></input><input type="%anyUE"></input></inputs><script><block s="doIfElse"><block var="test"/><script><block s="doReport"><block s="evaluate"><block var="true"/><list></list></block></block></script><script><block s="doReport"><block s="evaluate"><block var="false"/><list></list></block></block></script></block></script></block-definition><block-definition s="for %&apos;i&apos; = %&apos;start&apos; to %&apos;end&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%n">1</input><input type="%n">10</input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>step</l><l>tester</l></list></block><block s="doIfElse"><block s="reportVariadicGreaterThan"><list><block var="start"/><block var="end"/></list></block><script><block s="doSetVar"><l>step</l><l>-1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicLessThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script><script><block s="doSetVar"><l>step</l><l>1</l></block><block s="doSetVar"><l>tester</l><block s="reifyReporter"><autolambda><block s="reportVariadicGreaterThan"><list><block var="i"/><block var="end"/></list></block></autolambda><list></list></block></block></script></block><block s="doSetVar"><l>i</l><block var="start"/></block><block s="doUntil"><block s="evaluate"><block var="tester"/><list></list></block><script><block s="doRun"><block var="action"/><list></list></block><block s="doChangeVar"><l>i</l><block var="step"/></block></script></block></script></block-definition><block-definition s="join words %&apos;words&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%mult%txt"></input></inputs><script><block s="doWarp"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportCDR"><block var="words"/></block></custom-block><script><block s="doReport"><block s="reportListItem"><l>1</l><block var="words"/></block></block></script><list></list></block><block s="doReport"><block s="reportJoinWords"><list><block s="reportListItem"><l>1</l><block var="words"/></block><l> </l><custom-block s="join words %mult%txt"><block s="reportCDR"><block var="words"/></block></custom-block></list></block></block></script></block></script></block-definition><block-definition s="list $arrowRight sentence %&apos;data&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%l"></input></inputs><script><block s="doWarp"><script><block s="doReport"><custom-block s="join words %mult%txt"><block var="data"/></custom-block></block></script></block></script></block-definition><block-definition s="sentence $arrowRight list %&apos;text&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="text"/><l><option>whitespace</option></l></block></block></script></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%cs"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doRun"><block var="action"/><list></list></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;cont&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input></inputs><script><block s="doRun"><block var="cont"/><list></list></block></script></block-definition><block-definition s="catch %&apos;tag&apos; %&apos;value&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%anyUE"></input></inputs><script><block s="doCallCC"><block s="reifyScript"><script><block s="doSetVar"><l>tag</l><block var="cont"/></block><block s="doReport"><block s="evaluate"><block var="value"/><list></list></block></block></script><list><l>cont</l></list></block></block></script></block-definition><block-definition s="throw %&apos;tag&apos; %&apos;value&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">catchtag</input><input 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category="control"><header></header><code></code><translations></translations><inputs><input type="%boolUE"></input><input type="%cs"></input></inputs><script><block s="doDeclareVariables"><list><l>breakpoint</l></list></block><block s="doIf"><block s="evaluate"><block var="test"/><list></list></block><script><block s="doSetVar"><l>breakpoint</l><block var="test"/></block><block s="doShowVar"><l>breakpoint</l></block><block s="doRun"><block var="action"/><list></list></block><block s="doPauseAll"></block><block s="doHideVar"><l></l></block></script><list></list></block></script></block-definition><block-definition s="word $arrowRight list %&apos;word&apos;" type="reporter" category="operators"><header></header><code></code><translations></translations><inputs><input type="%txt"></input></inputs><script><block s="doWarp"><script><block s="doReport"><block s="reportTextSplit"><block var="word"/><l><option>letter</option></l></block></block></script></block></script></block-definition><block-definition s="ignore %&apos;x&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s"></input></inputs></block-definition><block-definition s="tell %&apos;sprite&apos; to %&apos;commands&apos;" type="command" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%txt">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="commands"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask for %&apos;reporter&apos; from %&apos;sprite&apos;" type="reporter" category="sensing"><header></header><code></code><translations></translations><inputs><input type="%repRing"></input><input type="%txt">Sprite</input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="reporter"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="tell %&apos;sprite&apos; %&apos;action&apos;" type="command" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%cs"></input></inputs><script><block s="doRun"><block s="reportAttributeOf"><block var="action"/><block var="sprite"/></block><list></list></block></script></block-definition><block-definition s="ask %&apos;sprite&apos; %&apos;expression&apos;" type="reporter" category="control"><header></header><code></code><translations></translations><inputs><input type="%s">Sprite</input><input type="%repRing"></input></inputs><script><block s="doReport"><block s="evaluate"><block s="reportAttributeOf"><block var="expression"/><block var="sprite"/></block><list></list></block></block></script></block-definition><block-definition s="centerAlign %&apos;text&apos;" type="command" category="pen"><header></header><code></code><translations></translations><inputs><input type="%txt" initial="1"></input></inputs><script><block s="doDeclareVariables"><list><l>marginL</l></list></block><block s="doDeclareVariables"><list><l>marginR</l></list></block><block s="doDeclareVariables"><list><l>line</l></list></block><block s="doDeclareVariables"><list><l>startX</l></list></block><block s="doDeclareVariables"><list><l>endX</l></list></block><block s="doDeclareVariables"><list><l>length</l></list></block><block s="doDeclareVariables"><list><l>textStart</l></list></block><block s="clear"></block><block s="up"></block><block s="doSetVar"><l>marginL</l><l>-200</l></block><block s="doSetVar"><l>marginR</l><l>200</l></block><block s="doSetVar"><l>line</l><l>100</l></block><block s="setColor"><color>8,0,0,1</color></block><block s="goToLayer"><l><option>front</option></l></block><block s="doSetVar"><l>startX</l><block s="xPosition"></block></block><block s="write"><block var="text"/><l>12</l></block><block s="doSetVar"><l>endX</l><block s="xPosition"></block></block><block s="doSetVar"><l>length</l><block s="reportDifference"><block var="endX"/><block var="startX"/></block></block><block s="clear"></block><block s="setColor"><color>31,4,0,1</color></block><block s="doSetVar"><l>textStart</l><block s="reportDifference"><block s="reportVariadicSum"><list><block var="marginL"/><block var="marginR"/></list></block><block s="reportQuotient"><block s="reportMonadic"><l><option>abs</option></l><block var="length"/></block><l>2</l></block></block></block><block s="gotoXY"><block var="textStart"/><block var="line"/></block><block s="write"><block var="text"/><l>12</l></block></script></block-definition></blocks><primitives></primitives><stage name="Stage" width="480" height="360" costume="0" color="255,255,255,1" tempo="60" threadsafe="false" penlog="false" volume="100" pan="0" lines="round" ternary="true" hyperops="true" codify="false" inheritance="false" sublistIDs="false" 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