Get coordinates of an element in multidimentional array in Javascript [duplicate]

Answer 1

Run a simple for loop and check if the character exists in the inner array using indexOf. return immediately once a match is found

var letterVariations = [
  [' ', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'],
  ['A', 'a', 'B', 'b', 'C', 'c', 'D', 'd', 'E', 'e', ';'],
  ['Â', 'â', 'F', 'f', 'G', 'g', 'H', 'h', 'Ê', 'ê', ':'],
  ['À', 'à', 'I', 'i', 'J', 'j', 'K', 'k', 'È', 'è', '.'],
  ['L', 'l', 'Î', 'î', 'M', 'm', 'N', 'n', 'É', 'é', '?'],
  ['O', 'o', 'Ï', 'ï', 'P', 'p', 'Q', 'q', 'R', 'r', '!'],
  ['Ô', 'ô', 'S', 's', 'T', 't', 'U', 'u', 'V', 'v', '“'],
  ['W', 'w', 'X', 'x', 'Y', 'y', 'Ù', 'ù', 'Z', 'z', '”'],
  ['@', '&', '#', '[', '(', '/', ')', ']', '+', '=', '-'],
];

function getCoordinates(array, char) {
  for (let i = 0; i < array.length; i++) {
    const i2 = array[i].indexOf(char);
    if (i2 !== -1)
      return [i, i2]
  }
  return undefined
}

console.log(getCoordinates(letterVariations, 'u'))
console.log(getCoordinates(letterVariations, '@'))

Note: This returns the indexes and it is zero-based. If you want [7, 7], you need to return [i+1, i2]