What does the double question mark mean?

If double question marks are uses it is to emphasise something in return, usually from the shock of the previous thing said. For example, if I said: ‘My dog just died’ (sad, but used for example…) Someone may reply.

What is double question mark react?

Conclusion. The JavaScript double question mark is also known as the nullish coalescing operator. It’s an operator that simply returns the right-side expression when the left side expression is either null or undefined .

What question mark means in PHP?

This is the PHP ternary operator (also known as a conditional operator) – if first operand evaluates true, evaluate as second operand, else evaluate as third operand. Think of it as an “if” statement you can use in expressions.

What does double question mark mean in laravel?

The definition of how it works is: It returns its first operand if it exists and is not NULL; otherwise it returns its second operand. So it’s actually just isset() in a handy operator. Those two are equivalent1: $foo = $bar?? ‘something’; $foo = isset($bar)? $

What does double question mark mean in Swift?

nil-coalescing operator
Double question mark is a nil-coalescing operator. In plain terms, it is just a shorthand for saying != nil . First it checks if the the return value is nil, if it is indeed nil, then the left value is presented, and if it is nil then the right value is presented.

What does a question mark symbolize?

A question mark is the symbol used to show that something is a question. It goes on the end of the sentence containing the question. For example, “Would you like an apple?” You will notice the question mark (?) at the end to denote that the statement is a question.

What is the double question mark operator?

The C# double question mark operator?? is called the null-coalescing operator. It is used to return the left hand side operand of the operator if the value is not null and the right hand side operand if the value is null. The advantage of this operator is that is simplifies the code and makes the code more readable.

What does double mean typescript?

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 double in PHP?

Floating point numbers ¶ Floating point numbers (also known as “floats”, “doubles”, or “real numbers”) can be specified using any of the following syntaxes: $a = 1.234; $b = 1.2e3; $c = 7E-10; $d = 1_234.567; // as of PHP 7.4.0.

What does double question mark mean in Python?

if null
double question mark operator means “if null”. Take the following expression, for example. String a = b?? ‘hello’; This means a equals b , but if b is null then a equals ‘hello’ .

What is double question mark in typescript?

Double question marks(??) or nullish coalescing operator helps us to assign default values to null or undefined variables in Angular and Typescript. It’s often called as Null coalescing operator. It’s introduced as part of Typescript 3.7 version.