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https://tinyurl.com/298ekxmq | 00:27:43 April 13, 2026

Got an HTTP 301 response at crawl time

Redirecting to...

https://core-js.io/playground#code=let+array+%3D+%5B1%5D%3B%0A%0Alet+map+%3D+new+Map%28%5B%5B%27a%27%2C+1%5D%2C+%5B42%2C+2%5D%5D%29%3B%0Amap.set%28array%2C+3%29.set%28true%2C+4%29%3B%0A%0Aconsole.log%28map.size%29%3B++++++++%2F%2F+%3D%3E+4%0Aconsole.log%28map.has%28array%29%29%3B++%2F%2F+%3D%3E+true%0Aconsole.log%28map.has%28%5B1%5D%29%29%3B++++%2F%2F+%3D%3E+false%0Aconsole.log%28map.get%28array%29%29%3B++%2F%2F+%3D%3E+3%0Amap.forEach%28%28val%2C+key%29+%3D%3E+%7B%0A++console.log%28val%29%3B+++++++++++%2F%2F+%3D%3E+1%2C+2%2C+3%2C+4%0A++console.log%28key%29%3B+++++++++++%2F%2F+%3D%3E+%27a%27%2C+42%2C+%5B1%5D%2C+true%0A%7D%29%3B%0Amap.delete%28array%29%3B%0Aconsole.log%28map.size%29%3B++++++++%2F%2F+%3D%3E+3%0Aconsole.log%28map.get%28array%29%29%3B++%2F%2F+%3D%3E+undefined%0Aconsole.log%28Array.from%28map%29%29%3B+%2F%2F+%3D%3E+%5B%5B%27a%27%2C+1%5D%2C+%5B42%2C+2%5D%2C+%5Btrue%2C+4%5D%5D%0A%0Amap+%3D+new+Map%28%5B%5B%27a%27%2C+1%5D%2C+%5B%27b%27%2C+2%5D%2C+%5B%27c%27%2C+3%5D%5D%29%3B%0A%0Afor+%28let+%5Bkey%2C+value%5D+of+map%29+%7B%0A++console.log%28key%29%3B+++++++++++++++++++++++++++++++++%2F%2F+%3D%3E+%27a%27%2C+%27b%27%2C+%27c%27%0A++console.log%28value%29%3B+++++++++++++++++++++++++++++++%2F%2F+%3D%3E+1%2C+2%2C+3%0A%7D%0Afor+%28let+value+of+map.values%28%29%29+console.log%28value%29%3B+%2F%2F+%3D%3E+1%2C+2%2C+3%0Afor+%28let+key+of+map.keys%28%29%29+console.log%28key%29%3B+++++++%2F%2F+%3D%3E+%27a%27%2C+%27b%27%2C+%27c%27%0Afor+%28let+%5Bkey%2C+value%5D+of+map.entries%28%29%29+%7B%0A++console.log%28key%29%3B+++++++++++++++++++++++++++++++++%2F%2F+%3D%3E+%27a%27%2C+%27b%27%2C+%27c%27%0A++console.log%28value%29%3B+++++++++++++++++++++++++++++++%2F%2F+%3D%3E+1%2C+2%2C+3%0A%7D%0A%0Amap+%3D+Map.groupBy%28%5B1%2C+2%2C+3%2C+4%2C+5%5D%2C+it+%3D%3E+it+%25+2%29%3B%0Amap.get%281%29%3B+%2F%2F+%3D%3E+%5B1%2C+3%2C+5%5D%0Amap.get%280%29%3B+%2F%2F+%3D%3E+%5B2%2C+4%5D%0A%0Amap+%3D+new+Map%28%5B%5B%27a%27%2C+1%5D%5D%29%3B%0A%0Amap.getOrInsert%28%27a%27%2C+2%29%3B+%2F%2F+%3D%3E+1%0A%0Amap.getOrInsert%28%27b%27%2C+3%29%3B+%2F%2F+%3D%3E+3%0A%0Amap.getOrInsertComputed%28%27a%27%2C+key+%3D%3E+key%29%3B+%2F%2F+%3D%3E+1%0A%0Amap.getOrInsertComputed%28%27c%27%2C+key+%3D%3E+key%29%3B+%2F%2F+%3D%3E+%27c%27%0A%0Aconsole.log%28map%29%3B+%2F%2F+%3D%3E+Map+%7B+%27a%27%3A+1%2C+%27b%27%3A+3%2C+%27c%27%3A+%27c%27+%7D

Impatient?