JSFiddle - React, Tailwind, and code Playground

HTML

<p id="text">
</p>

JavaScript

myArray = [ [ 'i', 7 ], [ 'l', 3 ], [ 's', 3 ], [ 'c', 3 ], [ 'a', 3 ], [ 'e', 2 ], [ 'o', 2 ], [ 'p', 2 ], [ 'r', 2 ], [ 'u', 2 ], [ 'g', 1 ], [ 'f', 1 ], [ 'd', 1 ], [ 't', 1 ], [ 'x', 1 ] ]

function comparator(a, b) {    
  if (a[1] > b[1]) return -1
  if (a[1] < b[1]) return 1
  return 0
}

myArray = myArray.sort(comparator)

document.getElementById('text').innerHTML =JSON.stringify(myArray)