How does Javascript's sort() work?

Question

How does the following code sort this array to be in numerical order?

var array=[25, 8, 7, 41]

array.sort(function(a,b){
  return a - b
})

Answer 1

run this code. You can see the exact step by step sorting process from the beginning to the end.

var array=[25, 8, 7, 41]
var count = 1;
array.sort( (a,b) => { 
console.log(`${count++}). a: ${a} | b: ${b}`);
return a-b;
});
console.log(array);