One JS little knowledge point every day, why should Object.is() be used in equality comparison
We all know that JavasSript is weakly typed, and when we use == for comparison, in some cases due to type conversion or "convert one of the two operands to the other, and then compare", there will be intentions Unexpected result.
0 == ' ' // true
null == undefined //true
[1] == true //true
Therefore, JavaScript provides us with the congruent operator ===, which is more strict than the incongruent operator and does not undergo type conversion. But using === for comparison is not the best solution. such as:
NaN === NaN //false
Fortunately, ES6 provides a new Object.is() method, which has some features of ===, and is better and more precise
Object.is(0 , ' '); //false
Object.is(null, undefined); //false
Object.is([1], true); //false
Object.is(NaN, NaN); //true
Figure comparison
