undefined (2024)

FAQs

What does it mean when an answer is undefined? ›

Broadly speaking, undefined means there is no possible value (or there are infinite possible values), while indeterminate means there is no value given the current information.

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 .

What does 'undefined' mean? 'Undefined' means there is no answer to the expression at that point.

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.

In geometry, point, line, and plane are considered undefined terms because they are only explained using examples and descriptions.

(1) His power is undefined, and therefore unlimited. (2) The money was lent for an undefined period of time. (3) The undefined world of my dark surroundings mingled with my black thoughts. (4) The house loomed undefined, a large bulk between her and the milky sky.

Undefined is a type of Data type in JavaScript. When a variable is declared and not initialized or not assigned with any value. By default, the variable was stored with an Undefined value.

The standard clearly defines that you will receive undefined when accessing uninitialized variables, non-existing object properties, non-existing array elements, and alike.

The simplest way to avoid undefined variable errors is to always declare and initialize your variables before using them. This helps ensure that your variables have valid values and are not accidentally accessed before they are declared or initialized.

undefined turns into false . null turns into false . 0 , -0 , and NaN turn into false ; other numbers turn into true .

Is undefined considered false? ›

Description. 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.

➢ What makes a rational expression undefined? A rational expression is undefined when the denominator is equal to zero. To find the values that make a rational expression undefined, set the denominator equal to zero and solve the resulting equation.

No. Undefined means that no practical meaning can be assigned. Not a Real number are those numbers that are not along the Real number line; that is any number with direction positive (right) or negative (left) and zero.

Any line that has an undefined slope is a vertical line, that has no y-intercept. Therefore the equation of a line with an undefined slope is x = a, where a = x-intercept.