CODEWITHSUNDEEP
javascript
davidhartman00
davidhartman00

Reputation: 353

Dividing a typeof number is Infinity?

Sorry in advance is this is an obvious question. I am dividing two variables and receiving Infinity as my result. Here are the details:

typeof a //'number'
typeof b //'number'
typeof (a-b) //'number'
typeof ((a-b)/(b)) //'number'
     a - b = xxx.xxxxx //this works
     (a - b)/b = Infinity

Here are some more details:

a and b are five decimal places (XXX.XXXXX)
// the variables are generated from ....
var z = document.getElementById('foo').getBoundingClientRect()
var y = document.getElementById('bar').getBoundingClientRect()
var a = z.x
var b = y.x

foo is a div and bar is a table a is generated outside a function b is generated inside the function from an .on('scroll', ....)

<div id="foo">
  <table id='bar'>
  </table>
</div>

I am assuming my issues comes from the typof = 'number'. In trying to find my answer in the following:

Upvotes: 3

Views: 794

Answers (2)

ivan.posokhin
ivan.posokhin

Reputation: 86

Probably, you divide by zero. Right?

enter image description here

Upvotes: 1

Ori Drori
Ori Drori

Reputation: 191976

It happens because b is 0, and dividing by 0 in JS returns Infinity. In addition the type of Infinity is number.

var a = 5
var b = 0

console.log('a ', typeof a);
console.log('b ', typeof b);
console.log('(a-b)/(b) ', (a-b)/(b))
console.log('(a - b)/b ', (a - b)/b)
console.log('typeof Infinity ', typeof Infinity)

Upvotes: 5

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