when within a 'for in' loop

Question

when within a 'for in' loop

Querying Object Equivalence:

I find myself struggling to comprehend the flow of my code and how I can rectify it.

Within the areEqual function, I am comparing the "value" property of two objects.

If they match -> isEqual=true -> continue with the loop If any values do not match -> isEqual = false and exit from the loop.

Nevertheless, I'm not achieving the expected outcomes. What specific logic am I failing to grasp here?

    function Address (street, city, zipCode) {
    this.street = street; 
    this.city = city; 
    this.zipCode = zipCode; 
}

let address1 = new Address('a', 'b', 'c'); 
let address2 = new Address('a', 'd', 'c'); 


//checking equality between two objects
function areEqual(address1, address2){  
    let isEqual = true; 
        for(let key in address1) {
            if(address1[key] === address2[key])
                isEqual = true; 
            else
                isEqual = false
                break; 
        }
    if(isEqual) return 'They are equal'; 
        else return 'They are not equal'; 

}

console.log(areEqual(address1, address2));

javascript for-loop

Answer 1

Answer №1

Your code has been modified to:

if (address1[key] === address2[key]) {
  isEqual = true;
} else {
  isEqual = false;
}
break;

Make sure to include curly brackets {} around your else condition to prevent breaking out of the loop on the first iteration.

function Address(street, city, zipCode) {
  this.street = street;
  this.city = city;
  this.zipCode = zipCode;
}

let address1 = new Address('a', 'b', 'c');
let address2 = new Address('a', 'd', 'c');

let address3 = new Address('x', 'y', 'z');
let address4 = new Address('x', 'y', 'z');

//checking for equality between two objects
function areEqual(address1, address2) {
  let isEqual = true;
  for (let key in address1) {
    if (address1[key] === address2[key]) {
      isEqual = true;
    } else {
      isEqual = false;
      break;
    }
  }
  if (isEqual) return 'They are equal';
  else return 'They are not equal';

}

console.log(areEqual(address1, address2));
console.log(areEqual(address3, address4));

To avoid these types of errors, always format your code properly. Most code editors have shortcuts for this functionality.

Note: This code will work as you have constructor function for Address. However, it only checks if the keys in address1 have the same value as in address2. If comparing an empty object like areEqual({}, address2), it will log They are equal because it never enters the for loop. To account for this, add a check to see if Object.keys(address1).length is the same as that of address2.

Answer 2

Your code has been modified to:

if (address1[key] === address2[key]) {
  isEqual = true;
} else {
  isEqual = false;
}
break;

Make sure to include curly brackets {} around your else condition to prevent breaking out of the loop on the first iteration.

function Address(street, city, zipCode) {
  this.street = street;
  this.city = city;
  this.zipCode = zipCode;
}

let address1 = new Address('a', 'b', 'c');
let address2 = new Address('a', 'd', 'c');

let address3 = new Address('x', 'y', 'z');
let address4 = new Address('x', 'y', 'z');

//checking for equality between two objects
function areEqual(address1, address2) {
  let isEqual = true;
  for (let key in address1) {
    if (address1[key] === address2[key]) {
      isEqual = true;
    } else {
      isEqual = false;
      break;
    }
  }
  if (isEqual) return 'They are equal';
  else return 'They are not equal';

}

console.log(areEqual(address1, address2));
console.log(areEqual(address3, address4));

To avoid these types of errors, always format your code properly. Most code editors have shortcuts for this functionality.

Note: This code will work as you have constructor function for Address. However, it only checks if the keys in address1 have the same value as in address2. If comparing an empty object like areEqual({}, address2), it will log They are equal because it never enters the for loop. To account for this, add a check to see if Object.keys(address1).length is the same as that of address2.

Answer 3

Answer №2

By default, the value of isEquals is set to true. If any key-value pairs are not equal, isEquals will be set to false and the loop will break:

function Address (street, city, zipCode) {
    this.street = street; 
    this.city = city; 
    this.zipCode = zipCode; 
}

let address1 = new Address('a', 'd', 'd'); 
let address2 = new Address('a', 'd', 'c'); 


// Checking for equality between two objects
function areEqual(address1, address2){  
    let isEqual = true; 
        for(let key in address1) {
            if(address1[key] !== address2[key])
            {
                isEqual = false
                break; 
            }
        }
    if(isEqual) return 'They are equal'; 
        else return 'They are not equal'; 

}

console.log(areEqual(address1, address2));

Answer 4

By default, the value of isEquals is set to true. If any key-value pairs are not equal, isEquals will be set to false and the loop will break:

function Address (street, city, zipCode) {
    this.street = street; 
    this.city = city; 
    this.zipCode = zipCode; 
}

let address1 = new Address('a', 'd', 'd'); 
let address2 = new Address('a', 'd', 'c'); 


// Checking for equality between two objects
function areEqual(address1, address2){  
    let isEqual = true; 
        for(let key in address1) {
            if(address1[key] !== address2[key])
            {
                isEqual = false
                break; 
            }
        }
    if(isEqual) return 'They are equal'; 
        else return 'They are not equal'; 

}

console.log(areEqual(address1, address2));

when within a 'for in' loop

Answer №1

Answer №2

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