JSFiddle - React, Tailwind, and code Playground

by Ersin Bilgin

JavaScript

var charList = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";

var numbers = [];

for ( var i = 0; i < charList.length; i++ ) {
    
    if ( charList.substr(i, 13).indexOf("0") == -1 ) {
        
        var num = 1;
        var charArray = charList.substr(i, 13).split("");
        
        for ( var j = 0; j < charArray.length; j++ ) {
            
            num *= parseInt( charArray[j] );
            
        }
        
    	numbers.push( num );
        
    }
    
}

console.log( numbers );

var lastNumber = (numbers.sort()[numbers.length - 1] + "").split("");
var product = 1;

for ( var i = 0; i < lastNumber.length; i++ ) {
    
    product *= parseInt( lastNumber[i] );
    
}

console.log( product );