There's no real difference; both will return undefined. Functions with no return statement will return undefined, as will functions with an empty return statement. To confirm this for yourself, …

Feb 5, 2014 · The difference is that a() calls the function while a is the function. console.log( a() ); // false console.log( a ); // function() {...} To make it clear what technically happens when you …

Aug 4, 2023 · without the parentheses you are assigning the function itself ( functions are first class objects ) whereas with the parentheses you are executing the function and assigning the …

Aug 4, 2020 · If you don't use parentheses, you're not calling the function. Instead you use its name, just like you would use a variable name for a string or a number. The addEventListener …

Mar 7, 2025 · The statements following the with statement refer to the PI property and the cos and sin methods, without specifying an object. JavaScript assumes the Math object for these …

Jun 10, 2020 · If the code needs to execute only one of two things (or a few things) use an if else (or a switch). If you only need to guard a single thing, use an if. The code in the original post …

【JavaScript function calls with and without parentheses】 Without parentheses, the function name is used as the pointer of the function. The name of a function is the pointer of the …

Jun 25, 2019 · You can call the same function with ‘new’ keyword and without ‘new’ keyword. You can call the same function through an object and not through an object. How you call the …

May 21, 2024 · To summarize, the key difference between passing a function reference with and without parentheses when setting up an event listener in JavaScript is that without …

Oct 1, 2015 · With declaration, it is required to write an identifier which in this case is withName. Both the example that you have given are of function expression where it is not required to …