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Where might we apply this? This could be helpful if you want to run a specific script when the array is empty, for example, to enable or disable buttons based on whether or not the necessary field has any input.
We’ll quickly go over the code and its demonstration to determine whether or not an array is empty and to explain the use of these particular functions.
First, we use the Array.isArray() method to determine whether a variable is an array. The variable will go to the else condition if the given variable is an array, in which case the condition !Array.isArray() will return False.
The function will return False if the supplied variable is something other than an array, such as undefined or another variable type, like a string or object. Now that we’ve established that the variable is an array, we can use the Array.length property to determine how long the array is. The array is considered empty, and the function returns TRUE if the object’s length is zero. Otherwise, the function will return false because the array is not empty.
Here, you can see that carArr is an array and meets the second requirement to determine whether the array’s length is empty. The function returns False since the array is not empty because it contains three elements. Since it is an array once more in the second scenario, arrTwo, it meets the second requirement. The function, in this case, returns True because the array is empty.
Make an array first, but without any elements. Once we are confident that we are only working with an array, we can quickly determine whether or not the array is empty by utilizing the length property. The array is empty if the length of the array is 0, else it is not empty.
var carArr = new Array("Ford", "Honda", "BMW"); var arrTwo = new Array(); console.log(!carArr.length); // false console.log(!arrTwo.length); // true
One obvious question is, why not use the length property right away? Will it not simplify the code? True, but before utilizing the length property, we need to ensure we’re working with an array because it can also indicate that a variable is empty for non-array variables.
We also discovered that it is better to check whether the provided value is an array as expected when using the Array.isArray function in conjunction with the.length property.
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