I tried comparing 2 same dates in the chrome console:
new Date("2021-06-23") == new Date("2021-06-23")
It is giving false
new Date("2021-06-23") > new Date("2021-06-23")
It is giving false
But, new Date("2021-06-23") >= new Date("2021-06-23")
It is giving true
I couldn't understand why it is giving true for greater than or equal to but false for both greater than also and for equals to as well.
Please explain.
Because new Date create an unique object.
Even if they have the sames properties, 2 distinct objects will never been equals.
const x = {a : "aaa"};
const y = {a : "aaa"};
console.log(x == y); // false
const z = x; // litteraly the same object
console.log(x == z); // trueThe Date object don't support grater or equal operators per se... It has something like Symbol.toPrimitive
It's a function that gets called when it should be converted to the appropriated primitive value
const object1 = {
[Symbol.toPrimitive](hint) {
if (hint === 'number') {
return 42;
}
return null;
}
};
console.log(+object1);
// expected output: 42
So if you want to compare if two dates are equals then you can do
+new Date() === +new Date()
when you use any of this operators + - * / < > then it wishes to convert it to a number so you are actually comparing numbers and not objects
==when applied to objects checks if they are the same object, not if two different objects but with similar content. Relationship operators instead do implicit conversion.Dateobjects have defined behaviour for>/>=/</<=operators that compares the date value.new Date("2021-06-23") == new Date("2021-06-23")would be true anyway, as the millisecond may change between calls.