How to loop through object properties using Object.entries() in JavaScript

published: 27 Sep 2022

2 min read

The Object.entries() method was introduced in ES8 and can be used for traversing an object.

Unlike the Object.values() method that creates an array of the values in the object, Object.entries() outputs an array of arrays.

Each nested array has two elements. The first element is the property and the second element is the value.

Here is an example:

const animals = {
  tiger: '🐅',
  cat: '🐱',
  monkey: '🐒',
  elephant: '🐘'
}

const entries = Object.entries(animals)
console.log(entries)

// [ [ 'tiger', '🐅' ],
//   [ 'cat', '🐱' ],
//   [ 'monkey', '🐒' ],
//   [ 'elephant', '🐘' ] ]

To iterate over the array returned by Object.entries(), you can either use the for...of loop or the forEach() method as shown below:

// 'for...of' loop
for (const [key, value] of Object.entries(animals)) {
  console.log('${key}: ${value}')
}

// 'forEach()' method
Object.entries(animals).forEach(([key, value]) => {
  console.log('${key}: ${value}')
})

Read this article to learn more about different ways of iterating over an object in JavaScript.

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How to loop through object properties using Object.entries() in JavaScript

The Object.entries() method was introduced in ES8 and can be used for traversing an object.

Unlike the Object.values() method that creates an array of the values in the object, Object.entries() outputs an array of arrays.

Each nested array has two elements. The first element is the property and the second element is the value.

Here is an example:

const animals = {
  tiger: '🐅',
  cat: '🐱',
  monkey: '🐒',
  elephant: '🐘'
}

const entries = Object.entries(animals)
console.log(entries)

// [ [ 'tiger', '🐅' ],
//   [ 'cat', '🐱' ],
//   [ 'monkey', '🐒' ],
//   [ 'elephant', '🐘' ] ]

To iterate over the array returned by Object.entries(), you can either use the for...of loop or the forEach() method as shown below:

// 'for...of' loop
for (const [key, value] of Object.entries(animals)) {
  console.log('${key}: ${value}')
}

// 'forEach()' method
Object.entries(animals).forEach(([key, value]) => {
  console.log('${key}: ${value}')
})

Read this article to learn more about different ways of iterating over an object in JavaScript.