Flatten an array of arrays,merge, làm phẳng một mảng các mảng (ok)

https://stackoverflow.com/questions/10865025/merge-flatten-an-array-of-arrays

const arrays = [
      ["$6"],
      ["$12"],
      ["$25"],
      ["$25"],
      ["$18"],
      ["$22"],
      ["$10"]
    ];
const merge3 = arrays.flat(1); //The depth level specifying how deep a nested array structure should be flattened. Defaults to 1.
console.log(merge3);