Course source code: https://codistwa.com/guides/data-structures-objects-dictionaries/. More courses on https://codistwa.com

objects.js

// ============================================================
// Definition of an object / dictionary
// ============================================================

const fruits = {
  color: 'red',
  length: 3
}

// ============================================================
// Copy by reference
// ============================================================

const fruits = {
  color: 'red',
  length: 3
}

const basket = fruits;

// point to the same object
console.log(basket.color);

basket.color = 'blue';

console.log(fruits.color); // blue

// changes
console.log(basket.color);

console.log(basket === fruits); // true

// ============================================================
// Delete a value key pair
// ============================================================

const basket = {
  color: 'red',
  length: 3
}

delete basket.color;
console.log(basket); // { length: 3 }

// ============================================================
// Add a value key pair
// ============================================================

const basket = {
  color: 'red',
  length: 3
}

basket.size = 'tall';

console.log(basket); // { color: 'red', length: 3, size: 'tall' }

objects.py

# ============================================================
# Definition of an object / dictionary
# ============================================================

fruits = {
  'color': 'red',
  'length': 3
}

# ============================================================
# Copy by reference
# ============================================================

fruits = {
    'color': 'red',
    'length': 3
}

basket = fruits

# point to the same object
print(basket['color'])

basket['color'] = 'blue'

print(fruits['color'])  # blue

# changes
print(basket['color'])

print(basket == fruits)  # True

# ============================================================
# Delete a value key pair
# ============================================================

basket = {
    'color': 'red',
    'length': 3
}

del basket['color']
print(basket) # {'length': 3}

# ============================================================
# Add a value key pair
# ============================================================

basket = {
    'color': 'red',
    'length': 3
}

basket['size'] = 'tall'
basket.update({'size': 'tail'})
print(basket) # {'color': 'red', 'length': 3, 'size': 'tail'}