In JavaScript, a double equals tests for loose equality and preforms type coercion. ... (project) => project.value == value ? JavaScript | Split a string with multiple separators, Check if an array is empty or not in JavaScript. It will always set newValue to 10 because 10 will always return true. Instead, we look to see if the value of the item is equal to an empty string: If the value is not equal to an empty string we simply loop around and repeat the process with the next item in the array. (No, not to that. Jon-G asked on 2009-07-16. we will use simple if condition and length of array with checking. When working with arrays, to avoid undefined, be sure to use valid array indexes and prevent the creation of sparse arrays. For y = 0 to 2 How to check if a variable is an array in JavaScript? JavaScript; 8 Comments. How to set the default value for an HTML