Split the customerName into firstName..the fisrt letter..the first index

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Fri Apr 30 2021 11:39:42 GMT+0000 (UTC)

Saved by @tapasdash #nodejs #mongoose #mongodb

db.customers.updateMany({},
  [{ $set : { m : {$arrayElemAt:[{ $split: ["$customerName", " "] },0]}} }],

);
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