Finds the index of a JS array that equals the array key value.

findindex.js

const items = {
  [
    id: 1,
    name: 'Ben'
  ],
  [
    id: 2,
    name: 'Angel'
  ],
  [
    id: 3,
    name: 'Robin'
  ]
}

// Find the index of name = 'Angel'.
const index = items.findIndex(function(item) {
  return item.name === 'Angel'
})

// Returns: 1