Let's use this with an if statement, and print out a message if our array is empty. Because arr.length is 0, or false, it returns true. With the operator added, it will return true if its operand is false. If we had not used the 'not' operator, arr.length would have returned 0. length property, to test if the array is empty or not. Next, let's use the logical 'not' operator, along with our. To open up your console in Chrome, you can click Inpsect -> Console.įirst, create an array with no items in it. That is, we can use it to return true if an array is empty.įor this example, let's open up our JavaScript console. length.length example threeīy combining the use of the length property and the logical 'not' operator in JavaScript, the '!' symbol, we can check if an array is empty or not. Here's the third way to check whether or not an array is empty using. If the array has elements in it, the code within the if block will not run. If our array is empty, the above message will get logged. We can also explicitly check if the array is empty or not. This will return 0, as there are 0 items in the array.length example two

Now we can check if the array is empty by using. length, we can do this in in three ways.length example oneįirst, let's create a new array with no elements. To check if the array is empty or not with. This will return 3, because there are 3 items in the array. Using the length property, we can check the length of the array: myArray.length Here we create a variable pointing towards an array. Here's an Interactive Scrim Showing How to Check if a JavaScript Array is Empty or Not with. An empty array will have 0 elements inside of it. By knowing the number of elements in the array, you can tell if it is empty or not. The length property sets or returns the number of elements in an array. To check if an array is empty or not, you can use the. When you're programming in JavaScript, you might need to know how to check whether an array is empty or not.

Javascript check if array