<snapdata remixID="14173504"><project name="U3L1-ShoppingList_Empty to Students" app="Snap! 10.4.5, 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 var="data"/></block></list></block></block></block></script><list><l>data</l></list></block></block><block s="doSetVar"><l>mapmany</l><block s="reifyScript"><script><block s="doIf"><custom-block s="empty? %l"><block s="reportListItem"><l>1</l><block var="data lists"/></block></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"/><custom-block s="map %repRing over %mult%l"><block s="reifyReporter"><autolambda><block s="reportListItem"><l>1</l><l/></block></autolambda><list></list></block><list><block var="data lists"/></list></custom-block></block><block s="evaluate"><block var="mapmany"/><list><custom-block s="map %repRing over %mult%l"><block s="reifyReporter"><autolambda><block s="reportCDR"><l/></block></autolambda><list></list></block><list><block var="data 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 type="%s"></input></inputs><script><block s="doRun"><block var="tag"/><list><block var="value"/></list></block></script></block-definition><block-definition s="for each %&apos;item&apos; of %&apos;data&apos; %&apos;action&apos;" type="command" category="lists"><header></header><code></code><translations></translations><inputs><input type="%upvar"></input><input type="%l"></input><input type="%cs"></input></inputs><script><block s="doUntil"><custom-block s="empty? %l"><block var="data"/></custom-block><script><block s="doSetVar"><l>item</l><block s="reportListItem"><l>1</l><block var="data"/></block></block><block s="doRun"><block var="action"/><list><block s="reportListItem"><l>1</l><block var="data"/></block></list></block><block s="doSetVar"><l>data</l><block s="reportCDR"><block var="data"/></block></block></script></block></script></block-definition><block-definition s="if %&apos;test&apos; do %&apos;action&apos; and pause all $pause-1-255-220-0" type="command" 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="Search %&apos;target&apos;" type="command" category="other"><header></header><code></code><translations></translations><inputs><input type="%s" initial="1"></input></inputs><script><block s="doForEach"><l>item</l><block var="ShoppingLIst"/><script><block s="doIf"><block s="reportVariadicEquals"><list><block var="item"/><block var="target"/></list></block><script><block s="doSayFor"><block s="reportJoinWords"><list><l>we do have </l><block var="target"/></list></block><l>2</l></block><block s="doStopThis"><l><option>this block</option></l></block></script><list></list></block></script></block><block s="doSayFor"><l>We don&apos;t have your item</l><l>2</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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