How to find the maximum of an irregular two-dimensional array

given an array, for example: 

var arr = [
    ["1","15","56"],
    ["1","15","56"],
    ["3","-","56"],
    ["1","78","-"],
    ["1","-","56"],
]

is there any elegant way to find the maximum value of the irregular two-dimensional array shown in the figure?

Node.js html5 javascript
Mar.31,2021

es6 is simple, if the two-dimensional array is pure numbers, then 

const max = Math.max(...[].concat(...arr));
console.log(max)

but I see that your array contains characters like -, so you have to go through Filter

first. 
const max = Math.max(...[].concat(...arr.map(_arr => _arr.map(v => isNaN(v) ? 0 : v))));
console.log(max)

es5 just cycle through it. It's ugly no matter how you write it. 

var max = 0;
arr.forEach(function (_arr) {
  _arr.forEach(function (v) {
    if (!isNaN(v) && v > max) max = v
  })
});
console.log(max)
var arr = [
    ['1','15','56'],
    ['1','15','56'],
    ['3','-','56'],
    ['1','78','-'],
    ['1','-','56'],
];

function dparseInt(i){
  var j = parseInt(i);
  if( isNaN(j) ) return 0;
  return j;
var arr = [
    ['1','15','56'],
    ['1','15','56'],
    ['3','-','56'],
    ['1','78','-'],
    ['1','-','56'],
];

function dparseInt(i){
  var j = parseInt(i);
  if( isNaN(j) ) return 0;
  return j;
}

//
var arr1 = arr.map(item=>{
  return item.map(i => dparseInt(i));
});

console.log(arr1);

//Math.max 
var result = Math.max(...arr1.map(v=>Math.max(...v)))
console.log(result)
Math.max.apply(null, arr.map(function(el) {
    return Math.max.apply(null, el.filter(function(item) {return +item}))
}))

try the subject

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