==, equal to

===, equal value and equal type

!=, not equal

!==, not equal value or not equal type

>, <, >=, <=

Primitives, like strings and numbers, are compared by their value

Objects, like arrays, dates, and plain objects, are compared by their reference

//Compare Numbers
var a = 10;
var b = 10;

var c = new Number(10);

console.log(a == b); //true
console.log(a === b); //true

console.log(a == c); //true
console.log(a === c); //false
		

//Compare Objects Addresses
var jangoFett = {
    	occupation: "Bounty Hunter",
    	genetics: "superb"
};

var bobaFett = {
    	occupation: "Bounty Hunter",
    	genetics: "superb"
};

var callMeJango = jangoFett;

console.log(jangoFett == bobaFett); //false
console.log(callMeJango == jangoFett); //true

console.log(jangoFett === bobaFett); //false
console.log(callMeJango === jangoFett); //true
		

var person_1 = {name: 'Lin', age: 39};
var person_2 = {name: 'Lin', age: 39};
var person_3 = person_1

function isEquivalent(a, b) {
	// If two variables point to the same object
	if (a === b)
		return true;

    // Create arrays of property names
    var aProps = Object.getOwnPropertyNames(a);
    var bProps = Object.getOwnPropertyNames(b);

    // If number of properties is different,
    // objects are not equivalent
    if (aProps.length != bProps.length) {
        return false;
    }

    for (var i = 0; i < aProps.length; i++) {
        var propName = aProps[i];

        // If values of same property are not equal,
        // objects are not equivalent
        if (a[propName] !== b[propName]) {
            return false;
        }
    }

    // If we made it this far, objects
    // are considered equivalent
    return true;
}

console.log(isEquivalent(person_1, person_2)); // true
console.log(isEquivalent(person_1, person_3)); // true
		

Object Equality in JavaScript