# javascript sort array of objects by number with code examples

JavaScript provides several ways to sort an array of objects by a specific property, such as a number. Here are a few examples of how to accomplish this task:

1. Using the sort() method with a custom comparator function
```let arr = [{num: 3}, {num: 1}, {num: 2}];

arr.sort(function(a, b) {
return a.num - b.num;
});

console.log(arr); // Output: [{num: 1}, {num: 2}, {num: 3}]
```

In this example, we have an array of objects that each have a property called "num". We use the sort() method and pass in a custom comparator function that compares the "num" property of each object. The function returns a negative value if the first object's "num" property is less than the second object's "num" property, a positive value if the first object's "num" property is greater than the second object's "num" property, and 0 if they are equal. This causes the sort() method to sort the array in ascending order based on the "num" property.

1. Using the sort() method with arrow function
```let arr = [{num: 3}, {num: 1}, {num: 2}];

arr.sort((a, b) => a.num - b.num);

console.log(arr); // Output: [{num: 1}, {num: 2}, {num: 3}]
```

In this example, we use the sort() method and pass in an arrow function that compares the "num" property of each object. The arrow function returns a negative value if the first object's "num" property is less than the second object's "num" property, a positive value if the first object's "num" property is greater than the second object's "num" property, and 0 if they are equal. This causes the sort() method to sort the array in ascending order based on the "num" property.

1. Using the sort() method with spread operator and ternary operator
```let arr = [{num: 3}, {num: 1}, {num: 2}];

arr.sort((a, b) => (a.num > b.num) ? 1 : ((b.num > a.num) ? -1 : 0));

console.log(arr); // Output: [{num: 1}, {num: 2}, {num: 3}]
```

In this example, we use the sort() method and pass in an arrow function that compares the "num" property of each object using ternary operator. The arrow function returns 1 if the first object's "num" property is greater than the second object's "num" property, -1 if the second object's "num" property is greater than the first object's "num" property, and 0 if they are equal. This causes the sort() method to sort the array in ascending order based on the "num" property.

1. Using the sort() method with a key and spread operator
```let arr = [{num: 3}, {num: 1}, {num: 2}];

arr.sort((a, b) => a.num - b.num);

console.log(arr); // Output: [{num: 1}, {num: 2}, {num: 3}]
```

In this example, we use
5. Using the sort() method with a key and the spread operator

```let arr = [{num: 3}, {num: 1}, {num: 2}];

arr.sort((a, b) => a.num - b.num);

console.log(arr); // Output: [{num: 1}, {num: 2}, {num: 3}]
```

In this example, we use the spread operator to extract the "num" property from each object and pass it as a key to the sort() method. This causes the sort() method to sort the array in ascending order based on the "num" property.

1. Using the Array.prototype.sort() method with the map function
```let arr = [{num: 3}, {num: 1}, {num: 2}];

let sortedArr = arr.map(e => e.num).sort((a, b) => a - b);

console.log(sortedArr); // Output: [1, 2, 3]
```

In this example, we use the map function to extract the "num" property from each object and store it in a new array. Then we use the sort() method to sort the new array in ascending order.

1. Using the Array.prototype.sort() method with the reduce function
```let arr = [{num: 3}, {num: 1}, {num: 2}];

let sortedArr = arr.reduce((acc, obj) => acc.concat(obj.num), []).sort((a, b) => a - b);

console.log(sortedArr); // Output: [1, 2, 3]
```

In this example, we use the reduce function to extract the "num" property from each object and store it in a new array. Then we use the sort() method to sort the new array in ascending order.

1. Using the Lodash library
```let arr = [{num: 3}, {num: 1}, {num: 2}];
let sortedArr = _.sortBy(arr, 'num');

console.log(sortedArr); // Output: [{num: 1}, {num: 2}, {num: 3}]
```

In this example, we use the Lodash library's `sortBy` method, which sorts the array of objects based on the specified property.

Each of these examples demonstrates a different approach to sorting an array of objects by a specific number property, and you can choose the one that best suits your needs. Remember that the sort() method modifies the original array, so if you don't want to change the original array, you can create a copy of it before sorting.

## Popular questions

1. How do I sort an array of objects by a specific property, such as a number, in JavaScript?
You can use the sort() method and pass in a custom comparator function that compares the specific property of each object. The function should return a negative value if the first object's property is less than the second object's property, a positive value if the first object's property is greater than the second object's property, and 0 if they are equal. This causes the sort() method to sort the array in ascending order based on the specific property.

2. Can I use the sort() method with an arrow function to sort an array of objects by a specific property?
Yes, you can use the sort() method with an arrow function to sort an array of objects by a specific property. The arrow function should compare the specific property of each object and return a negative value if the first object's property is less than the second object's property, a positive value if the first object's property is greater than the second object's property, and 0 if they are equal.

3. Is it possible to sort an array of objects by a specific property using the map function?
Yes, you can use the map function to extract the specific property from each object and store it in a new array. Then you can use the sort() method to sort the new array in ascending order based on the specific property.

4. Can I use the reduce function to sort an array of objects by a specific property?
Yes, you can use the reduce function to extract the specific property from each object and store it in a new array. Then you can use the sort() method to sort the new array in ascending order based on the specific property.

5. Does the Lodash library provide a method for sorting an array of objects by a specific property?
Yes, the Lodash library provides the sortBy() method, which sorts the array of objects based on the specified property.

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