Javascript-How to get the second larger integer by "array"?

Question

"Find the two largest values among the 10 digits entered. p.s. Use 'prompt' to get the integer from user."

I would like to solve this question by "array", not "if", what should I do?

I have tried, but error.....

<script type="text/javascript">
var a, b, c;
var arr = new Array[3];
arr[0] = a;
arr[1] = b;
arr[2] = c;
a = window.prompt("Enter a number");
b = window.prompt("Enter a number");
c = window.prompt("Enter a number");
arr.sort(function(a,b){return a - b})
window.alert(arr[arr.length-1] + " and " + arr[arr.length-2]) 
</script>

Answer 1

Sort the array and use the last 2 values as the answer. Is this homework?

Answer 2

Loop over the array, keeping track of the two largest encountered so far.

Answer 3

Iterate over the array, find the largest number, remember it somewhere, remove it, repeat.

Answer 4

use javascript sort function: array.sort(). since this sorts alphabetically by default you're gonna have to define a sort function like this:

var theArray=[3,4,26,7]
theArray.sort(function(a,b){return b - a;})

then you'll have to get the second value in the array since the function sorts it in descending order

ive taken this from your code above. try this:

<script type="text/javascript">
var a, b, c;
var arr = new Array();
a = window.prompt("Enter a number");
arr[0] = a;
b = window.prompt("Enter a number");
arr[1] = b;
c = window.prompt("Enter a number");
arr[2] = c;

arr.sort(function(a,b){return a - b})
window.alert(arr[arr.length-1] + " and " + arr[arr.length-2]) 
</script>

you were inserting values that are not yet defined. you'll have to let the user enter the value first before putting it in the array

Answer 5

Here it is:

Array.prototype.simpleSortInsert = function (item) {
/*  Insert an element in an array keeping it sorted. Only supports numbers. */
    for (var i = 0, l = this.length, didit = false; i < l; ++i) {
        if (this[i] > item) {
            this.splice(i, 0, item);
            didit = true;
            break;
        }
    }
    if (!didit) {
        this.push(item);
    }
    return i;
};


var myArray = [], limit = 10;
for (var i = 0; i < limit; ++i) {
    myArray.simpleSortInsert(parseInt(prompt('Please enter a number (' + (i + 1) + '/10):')));
}

alert('The two largest numbers you entered are ' + myArray[limit - 1] + ' and ' + myArray[limit - 2]);

Answer 6

Try the following:

var arr=new Array();
var i=0;
var v1;
var v2;

arr[0]=10;
arr[1]=8;
arr[2]=2;
arr[3]=1;
arr[4]=4;
arr[5]=3;
arr[6]=9;
arr[7]=7;
arr[8]=5;
arr[9]=6;

for(i=0;i<10;i++)
{
if(i<2)
{
if(arr[0]<arr[1])
{
v1=arr[1];
v2=arr[0];
}
else
{v1=arr[0];
v2=arr[1];
}
}
else
{
if(arr[i]>v1)
{
v2=v1;
v1=arr[i];
}
else if(arr[i]<v1 && arr[i]>v2)
{
v2=arr[i];
}
}
}
document.write(v1);
document.write(v2);