Javascript array.push change the long integer number?

Question

Hello my javascript code is below.

<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = fruits;

function myFunction() {
    fruits.push(611087636212662272);
    document.getElementById("demo").innerHTML = fruits;
}
</script>

Output is

Banana,Orange,Apple,Mango,611087636212662300

I need the Output as:

Banana,Orange,Apple,Mango,611087636212662272

I entered "611087636212662272" then why does Javascript return "611087636212662300" as output.

How can I resolve this?

stackoverflow.com/questions/21278234/… - tldr; that is as exact a number as JavaScript can represent. The 'rounding' is due to limitations of floating point numbers (which all numbers in JavaScript are). The literal 611087636212662272 results in the value 611087636212662300 - try it: 611087636212662272 === 611087636212662300 is true. — user2864740
– user2864740, Commented Jul 8, 2015 at 6:38
What solution to choose to fix this depends on what you are using the number for (i.e. which operations you perform with it). — Felix Kling
– Felix Kling, Commented Jul 8, 2015 at 6:41

Unni Babu · Accepted Answer · 2015-07-08 06:40:21Z

0

Solution - add " in value, it will add exact value to fruits array.


    fruits.push("611087636212662272"); // this will push exact value

answered Jul 8, 2015 at 6:40

Unni Babu

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2 Comments

Renish Khunt Over a year ago

get a data form database and i have more then 5000 data it's not possible to convert from Integer to String. if i create a loop then it's take time. my application is already slow.

Felix Kling Over a year ago

Well, the added value will be a string now, instead of a number. A possible solution, but it changes the way the value can be processed.

Daniele Veneroni · Accepted Answer · 2015-07-08 06:43:47Z

0

The number is too big and lose precision. JavaScript Numbers are 64-bit floating point values, the largest exact integral value is 2^53, or 9007199254740992.

ECMA Section 8.5 - Numbers

Note that all the positive and negative integers whose magnitude is no greater than 2^53 are representable in the Number type (indeed, the integer 0 has two representations, +0 and −0).

answered Jul 8, 2015 at 6:43

Daniele Veneroni

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1 Comment

Chris Hayes Over a year ago

Saying "the largest exact integral value is 2^53" is not correct. There are exact integral values larger than that - 611087636212662300 from the question is one of them. The important point is that not all integers larger than 2^53 are representable, and these gaps manifest themselves in apparent "rounding" of numbers, to nearby exactly-representable numbers.

Danish Khan · Accepted Answer · 2015-07-08 06:57:01Z

0

this is another way to achive

var fruits = ["Banana", "Orange", "Apple", "Mango"];
var fruitNum  = fruits + ' 611087636212662272';
document.getElementById("demo").innerHTML = fruitNum;

answered Jul 8, 2015 at 6:57

Danish Khan

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