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a guest Aug 25th, 2019 69 Never
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  1. const t1 = [
  2.     { x: 1, y: 2 },
  3.     { x: 3, y: 4 },
  4.     { x: 5, y: 6 }
  5. ]  //?  [1, 2, 3, 4, 5, 6]
  6.  
  7.  
  8. t1.flatMap(c => [c.x, c.y])
  9.  
  10. const orders = [
  11.     {
  12.         orderId: 42,
  13.         items: [
  14.             {name: 'soap', price: 1.99},
  15.             {name: 'shampoo', price: 4.99}
  16.         ]
  17.     },
  18.     {
  19.         orderId: 1337,
  20.         items: [
  21.             {name: 'toothpaste', price: 5.59},
  22.             {name: 'toothbrush', price: 8.99}
  23.         ]
  24.     }
  25. ];
  26.  
  27. orders.flatMap(o => o.items.map(i => i.name));
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