Javascript — uncaught typeerror: cannot read property '1' of undefined

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I can't access the array.

Uncaught TypeError: Cannot read property '1' of undefined

var n = new Date(this[Y + 1][1]).getTime();

(4) [Array(2), Array(2), Array(2), Array(2)]
   0: Array(2)
      0: "Consectetur Adipiscing"
      1: "Aug 15, 2020 15:20:10"
      length: 2
__proto__: Array(0)
1: Array(2)
      0: "Hendrerit Sit Amet"
      1: "Sep 10, 2021 18:30:15"
      length: 2
__proto__: Array(0)
2: Array(2)
      0: "Donec Congue Fringilla"
      1: "Jul 30, 2021 15:50:30"
      length: 2
__proto__: Array(0)
3: Array(2)
      0: "Nulla Vel Aliquam Odio"
      1: "Dec 25, 2021 12:10:45"
      length: 2
__proto__: Array(0)
      length: 4
__proto__: Array(0)

What I have tried:

<pre lang="JS"><pre>Object.defineProperty(Array.prototype, "bubbleSort", {
    value: function bubbleSort(){
        var Length = this.length;

        for (X = 0; X < Length; X++)
        {
            for (Y = 0; Y < Length - X; Y++)
            {
                var p = new Date(this[Y][1]).getTime();
                var n = new Date(this[Y + 1][1]).getTime();

                if (p > n)
                {
                    var Temporary = this[Y][1];
                    this[Y][1] = this[Y + 1][1];
                    this[Y + 1][1] = Temporary;
                }
            }
        }
    }
});

Posted 17-Apr-21 7:37am

Jelmapadru

Updated 18-Apr-21 23:30pm

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Richard Deeming · Answer 1 · 2021-04-18T23:30:00

Consider the last two iterations of your inner loop on the first iteration of the outer loop:
X === 0

On the penultimate iteration, Y === Length - 1; therefore, this[Y + 1] is equivalent to this[Length], which is beyond the end of the array.
On the final iteration, Y === Length; therefore, this[Y] will not return anything, because the index is beyond the end of the array.
(this[Y + 1] will not return anything either.)

You need to fix your code to implement the sort correctly.