What does the exclamation mark do before the function?
What does the exclamation mark do before the function? In JavaScript, the exclamation mark (!) before a function is often used to indicate that the function will return a Boolean…
Detecting an undefined object property
Detecting an undefined object property In JavaScript, you can use the typeof operator to check if an object property is defined. The typeof operator returns the type of a variable…
How to solve the “TypeError: array.splice is not a function” when ‘var array = {}’?
How to solve the "TypeError: array.splice is not a function" when 'var array = {}'? The splice() method is used to add or remove elements from an array. It is…