Complete year input date for onchange event JS

Question

// Return a number function

const validateYear = (e)=>{

var maxDigit = 0;
var minDigit = 1000;
var diff = 0;
var rest = 0;

var i = 0;
while ( i <= 3 ){
if ( e[i] > maxDigit ){
maxDigit = e[i];
} else {
minDigit = e[i];
}
i++;
}

if ( e[0] > e[1] ){
rest = e[1] - e[0] - e[2] - e[3];
} else if ( e[0] > e[3] ){
rest = e[1] - e[3] - e[2] - e[0];
}

diff = (rest) / ( maxDigit + 1 );

return diff;

}

Answer 1

So what is your question?