add example with let
add example with let
hltj/kotlin-web-site-cn,tsuijten/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,tsuijten/kotlin-web-site,tsuijten/kotlin-web-site,hltj/kotlin-web-site-cn,hltj/kotlin-web-site-cn,tsuijten/kotlin-web-site