undefined (2024)

FAQs

What answer is undefined? ›

What does 'undefined' mean? 'Undefined' means there is no answer to the expression at that point. Think of it as the value where you end with more question marks at the end.

When something is undefined, this means that there are no solutions. However, when something in indeterminate, this means that there are infinitely many solutions to the question. Again, zero and infinity are the root to a lot of mathematics, including the difference between these two words.

To find the values that make a rational expression undefined, set the denominator equal to zero and solve the resulting equation. Example: 0 7 2 3 x x − Is undefined because the zero is in the denominator.

You can't divide by 0 because n/0 is undefined. You might think that it's ±♾️, but it's not. You can't have both infinity sides at the same time. Thus, 3÷0 is undefined.

“Undefined” just means literally that the expression in question has not been given a definition (usually because there is no way to define it that seems to be helpful). By the way, the expression 0/0 is undefined.

So if something is undefined, it's not yet determined. Definitions of undefined. adjective. not precisely limited, determined, or distinguished.

Null in JavaScript means an empty value and is also a primitive type in JavaScript. The variable which has been assigned as null contains no value. Undefined, on the other hand, means the variable has been declared, but its value has not been assigned.

In mathematics, the term undefined is often used to refer to an expression which is not assigned an interpretation or a value (such as an indeterminate form, which has the possibility of assuming different values). The term can take on several different meanings depending on the context.

A falsy value is something which evaluates to FALSE, for instance when checking a variable. There are only six falsey values in JavaScript: undefined , null , NaN , 0 , "" (empty string), and false of course.

A variable that has not been assigned a value is of type undefined . A method or statement also returns undefined if the variable that is being evaluated does not have an assigned value. A function returns undefined if a value was not returned .

How do you check if it is undefined? ›

"undefined" thing, both "no solution" and "infinitely many solutions" (and in general anything other than "exactly one solution") mean that the expression representing the equation is undefined.

In algebra, an undefined expression means a finite value does not exist, and an undefined limit is similarly defined. A limit is undefined if there is not a finite value that can be found for the limit.

If f is a partial function on S and a is an element of S, then this is written as f(a)↓ and is read as "f(a) is defined." If a is not in the domain of f, then this is written as f(a)↑ and is read as "f(a) is undefined".

Undefined is used to indicate that a variable has not been assigned a value. It is not a valid value, and we cannot perform arithmetic operations with it. Zero is used to represent the absence of a value in a numerical context. It is a valid value, and we can perform arithmetic operations with it.

We can say that zero over zero equals "undefined." And of course, last but not least, that we're a lot of times faced with, is 1 divided by zero, which is still undefined.

For example: In various branches of mathematics, certain concepts are introduced as primitive notions (e.g., the terms "point", "line" and "plane" in geometry). As these terms are not defined in terms of other concepts, they may be referred to as "undefined terms".