Interviewers often want to know that you are very familiar with the JavaScript array. There are multiple ways to create an array:

  • It is considered bad practice to use the array constructor: const badExample = new Array()
  • Assigning to a list of values between square brackets: const example1 = [1]
  • Creating an array from an existing array with Map or Filter: const example2 = (val) => val + 1 )