What does two exclamation marks mean in JavaScript?

If you have ever noticed a double exclamation mark (!!) in someone’s JavaScript code you may be curious what it’s for and what it does. It’s really simple: it’s short way to cast a variable to be a boolean (true or false) value.

What is the function of exclamation mark?

The exclamation mark, !, also sometimes referred to as the exclamation point, especially in American English, is a punctuation mark usually used after an interjection or exclamation to indicate strong feelings, or to show emphasis. The exclamation mark often marks the end of a sentence, for example: “Watch out!”

What does before function mean in JavaScript?

By Xah Lee. It means, define a function expression, and evaluate it right there. …

What does exclamation mark mean in code?

In programming and scripting languages, the exclamation mark is used as “not.” For example, “! =” also means not equal. See our operator definition for further information. Used to help identify a nonexecutable statement.

What do double exclamation marks mean?

‼️ Meaning – Double Exclamation Mark Emoji This emoji could be used to show extra excitement at a statement, or for added emphasis. It can be a stand alone text, and has the definition of “I’m excited”. Double Exclamation Mark Emoji could be used in regards to exciting or shocking news, and has an anticipatory tone.

What is a double Javascript?

Some people call it the “Javascript double negative trick”. Essentially it converts a value (null, undefined, objects etc…) to a primitive Boolean value. Similar to typecasting explicitly using Boolean(value) except this converts the value to a Bololean Object and is not a true boolean.

Can we use exclamation mark after thanks?

There never has been any obligation to use an exclamation mark anywhere, unless we wish to highlight strong feelings of anger, surprise, or some such emotion. We would use it after Thank you only if we wished to show strong emotion.

What should I learn before JavaScript?

Before starting this module, you don’t need any previous JavaScript knowledge, but you should have some familiarity with HTML and CSS….Prerequisites

• Getting started with the Web (which includes a really basic JavaScript introduction).
• Introduction to HTML.
• Introduction to CSS.

What is the point of a function in JavaScript?

Points to Remember : JavaScript a function allows you to define a block of code, give it a name and then execute it as many times as you want. A function can be defined using function keyword and can be executed using () operator. A function can include one or more parameters.

Why is my exclamation mark not working?

Hold down both shift keys and then press alt, and it should fix it. It shifts back and forth between European and American keyboards!

What does it mean when a girl puts 2 exclamation points?

What does it mean when a girl puts 2 Exclamation points? It shows excitement. Girls use it more because they are more excitable, they want to share their feelings, and their excessive use dampens it’s effect. So they need two exclamations where one used to do.