<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div><br><blockquote type="cite" class="clean_bq" style="font-family: Helvetica, Arial; font-size: 13px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><span><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class="">A workaround is to declare two local variables:</div><div class=""><br class=""></div><div class=""><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(187, 44, 162);">let</span><span class="Apple-converted-space"> </span><span class="" style="font-variant-ligatures: no-common-ligatures;">e =</span><span class="Apple-converted-space"> </span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(61, 29, 129);">zip</span><span class="" style="font-variant-ligatures: no-common-ligatures;">(</span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(79, 129, 135);">a</span><span class="" style="font-variant-ligatures: no-common-ligatures;">,</span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(79, 129, 135);">b</span><span class="" style="font-variant-ligatures: no-common-ligatures;">).</span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(61, 29, 129);">reduce</span><span class="" style="font-variant-ligatures: no-common-ligatures;">(</span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(39, 42, 216);">0</span><span class="" style="font-variant-ligatures: no-common-ligatures;">) { acc, tuple </span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(187, 44, 162);">in</span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures;"> </span><span class="Apple-converted-space"> </span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(187, 44, 162);">let</span><span class="" style="font-variant-ligatures: no-common-ligatures;"> value1 = tuple.</span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(39, 42, 216);">0</span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures;"> </span><span class="Apple-converted-space"> </span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(187, 44, 162);">let</span><span class="" style="font-variant-ligatures: no-common-ligatures;"> value2 = tuple.</span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(39, 42, 216);">1</span></div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures;"> </span><span class="Apple-converted-space"> </span><span class="" style="font-variant-ligatures: no-common-ligatures; color: rgb(187, 44, 162);">return</span><span class="Apple-converted-space"> </span><span class="" style="font-variant-ligatures: no-common-ligatures;">acc + value1 + </span>value2</div><div class="" style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo;"><span class="" style="font-variant-ligatures: no-common-ligatures;">}</span></div></div></div></span></blockquote></div><p>You can also get away with one assignment:</p><p style="margin: 0px; font-size: 14px; line-height: normal; font-family: Monaco;"><span style="font-variant-ligatures: no-common-ligatures;">let</span><span style="font-variant-ligatures: no-common-ligatures;"> ok = </span><span style="font-variant-ligatures: no-common-ligatures;">zip</span><span style="font-variant-ligatures: no-common-ligatures;">(</span><span style="font-variant-ligatures: no-common-ligatures;">a</span><span style="font-variant-ligatures: no-common-ligatures;">,</span><span style="font-variant-ligatures: no-common-ligatures;">b</span><span style="font-variant-ligatures: no-common-ligatures;">).</span><span style="font-variant-ligatures: no-common-ligatures;">reduce</span><span style="font-variant-ligatures: no-common-ligatures;">(</span><span style="font-variant-ligatures: no-common-ligatures;">0</span><span style="font-variant-ligatures: no-common-ligatures;">) { acc, tuple </span><span style="font-variant-ligatures: no-common-ligatures;">in</span></p><p style="margin: 0px; font-size: 14px; line-height: normal; font-family: Monaco;"><span style="font-variant-ligatures: no-common-ligatures"> </span><span style="font-variant-ligatures: no-common-ligatures;">let</span><span style="font-variant-ligatures: no-common-ligatures"> (value1, value2) = tuple</span></p><p style="margin: 0px; font-size: 14px; line-height: normal; font-family: Monaco;"><span style="font-variant-ligatures: no-common-ligatures"> </span><span style="font-variant-ligatures: no-common-ligatures;">return</span><span style="font-variant-ligatures: no-common-ligatures"> acc + value1 + value2</span></p><p>
</p><p style="margin: 0px; font-size: 14px; line-height: normal; font-family: Monaco;"><span style="font-variant-ligatures: no-common-ligatures;">}</span></p><div><br class="Apple-interchange-newline"></div><div>Best,</div><div>Krzysztof</div></body></html>