Definition

You create an object using curly brackets. You can also directly include some entries. For that, state the key first, followed by a colon and the value.

const emptyObject = {};

const obj = {
  favoriteNumber: 42,
  greeting: 'Hello World',
  useGreeting: true,
  address: {
    street: 'Trincomalee Highway',
    city: 'Batticaloa',
  },
  fruits: ['melon', 'papaya'],
  addNumbers: function (a, b) {
    return a + b;
  },
};

The trailing comma after the last entry is optional in JavaScript.

If the key follows the naming rules for a JavaScript identifier, you can omit the quotation marks. For keys with special characters in the name, you need to use the usual string notation.

const obj = {
  '1keyStartsWithNumber': '...',
  'key/with/slashes': '...',
  'key-with-dashes': '...',
  'key with spaces': '...',
  '#&()[]{}èä樹keyWithSpecialChars': '...',
};

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Backlinks

• Objects