If you're working with JavaScript arrays and need to add an object to an array, there are a few simple ways to do it. One common method is to use the push() method to add the object to the end of the array. Here's how you can do that:

```javascript

let arr = [{id: 1, name: 'John'}, {id: 2, name: 'Jane'}];

let newObj = {id: 3, name: 'Bob'};

arr.push(newObj);

```

In this example, the object `{id: 3, name: 'Bob'}` is added to the `arr` array using the `push()` method.

Another method to add an object to an array is to use the spread operator. Here's how you can do that:

```javascript

let arr = [{id: 1, name: 'John'}, {id: 2, name: 'Jane'}];

let newObj = {id: 3, name: 'Bob'};

arr = [...arr, newObj];

```

In this example, the spread operator is used to create a new array that includes all the elements from the original `arr` array as well as the `newObj` object. The new array is then assigned back to the `arr` variable.

You can also add an object at a specific index in the array using the splice() method. Here's an example:

```javascript

let arr = [{id: 1, name: 'John'}, {id: 2, name: 'Jane'}];

let newObj = {id: 3, name: 'Bob'};

arr.splice(1, 0, newObj);

```

In this example, the `splice()` method is used to add the `newObj` object at index 1 in the `arr` array without removing any elements. The syntax for `splice()` is `array.splice(start, deleteCount, item1, item2, ...)`, where `start` is the index at which to start modifying the array, `deleteCount` is the number of elements to remove, and `item1`, `item2`, etc. are the elements to add.

These are some of the common ways to add an object to an array in JavaScript. Depending on your specific use case, one method may be more suitable than the others. By understanding how to use the push() method, spread operator, and splice() method, you can effectively add objects to arrays in your JavaScript projects.