Evaluating different attributes within a single entity

I was attempting to write some code that checks if two individuals share the same birthday. Person "a" and person "b" do not have the same birthday, yet the console output shows:

a was born on day 1
a has the same birthday as a
a has the same birthday as b
b was born on day 2
b has the same birthday as a
b has the same birthday as b

when it should read:

a was born on day 1
a has the same birthday as a
b was born on day 2
b has the same birthday as b

Here's the code snippet:

var people = {
    a: {
        name: "a",
        birthday: 1,
    },
    b: {
        name: "b",
        birthday: 2,
    }
};


for(var x in people) {
    console.log(people[x].name + " was born on day " + people[x].birthday)
    for(var y in people) {
        if(people[x].birthday = people[y].birthday) {
            console.log(people[x].name + " has the same birthday as " + people[y].name)
        }
    }
}

people[x].birthday = people[y].birthday

The issue seems to stem from this line of code.

javascript

Answer №1

When checking if two people have the same birthday in a code, ensure you use the '==' operator instead of '='. The '=' operator is for assignment, while '==' is for comparison.

In this context, using the '=' operator would mean assigning the value of person y's birthday to person x's birthday, resulting in both birthdays being the same.

On the other hand, using the '==' operator allows you to compare whether person y has the same birthday as person x.

Answer №2

In JavaScript, when comparing two objects, it is important to use the Identity / strict equality operator ===. This allows for a thorough comparison between the two objects, as shown in the following example:

people[x].birthday === people[y].birthday

To learn more about this concept, refer to the Comparison operators documentation.

Please note:

Using 

people[x].birthday = people[y].birthday
will always result in true because you are assigning values, not comparing them.

Answer №4

Here are a couple of issues to address:

  1. The comparison in your code resembles an assignment rather than an equality check

people[x].birthday = people[y].birthday

It should be changed to:

people[x].birthday === people[y].birthday
  1. The second problem lies in your for loops. You are iterating through the collection twice with both starting at the same index (0).

A better approach would be to compare each person with every other individual in the list like so:

for(var index = 0; index < people.length; index++) {
   console.log(people[x].name + " was born on day " + people[x].birthday)
    for(var inner = index; inner < people.length; inner+1) {
        if(people[index].birthday == people[inner].birthday) {
            console.log(people[index].name + " shares the same birthday with " + people[inner].name)
        }
    }
}

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