Comparing NaN values for equality in Javascript

I need to compare two numeric values for equality in Javascript. The values may be NaN as well. I've come up with this code:

if (val1 == val2 || isNaN(val1) && isNaN(val2)) ...

which is working fine, but it looks bloated to me. I would like to make it more concise. Any ideas?

Try using Object.is(), it determines whether two values are the same value. Two values are the same if one of the following holds:

• both undefined
• both null
• both true or both false
• both strings of the same length with the same characters in the same order
• both the same object
• both numbers and
  • both +0
  • both -0
  • both NaN
  • or both non-zero and both not NaN and both have the same value

e.g. Object.is(NaN, NaN) => true

Refer to https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is