how to merge array of arrays in javascript code example

Example 1: js concat arrays with redeuce

var arrays = [
  ["$6"],
  ["$12"],
  ["$25"],
  ["$25"],
  ["$18"],
  ["$22"],
  ["$10"]
];
var merged = [].concat.apply([], arrays);

console.log(merged);

Example 2: js convert array of arrays to array

// Converts array with multiple values into a single array with all items:
var merged = [].concat.apply([], arrays);