A brief analysis of Javascript ES6 new value comparison function Object.is

Before Object.is appears, we use the two equal sign "==" or the three equal sign "===" to compare the values. The three equal sign is more stringent. If the two parties compare different types, they will immediately return false.

In addition, there is only one value that is not equal to itself, it is NaN

Now ES6 has added another Object.is to make the world of comparative operations even more chaotic.

In most cases, Object.is is equivalent to "===", as follows

 1 === 1 // trueObject.is(1, 1) // true 'a' === 'a' // trueObject.is('a', 'a') // true true === true // trueObject.is(true, true) // true null === null // trueObject.is(null, null) // true undefined === undefined // trueObject.is(undefined, undefined) // true

But for NaN, 0, +0, -0, it is different from "==="

 NaN === NaN // falseObject.is(NaN, NaN) // true 0 === -0 // trueObject.is(0, -0) // false -0 === +0 // trueObject.is(-0, +0) // false

The above is all about the Javascript ES6 new value comparison function Object.is. I hope it will be helpful to everyone's study and work.