If a variable is accessed before defining then JS will show it as not defined, and if a variables is defined but not initialized I.e. no values is assigned it to it before accessing, then its undefined. Null means an empty or non-existent value. Null is assigned, and explicitly means nothing.
What is the difference between defined and undefined?
The difference between Defined and Undefined When used as adjectives, defined means having a definition or value, whereas undefined means lacking a definition or value. Having a definition or value.
What is number 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.
How do you explain undefined?
adjective. without fixed limits; indefinite in form, extent, or application: undefined authority; undefined feelings of sadness. not given meaning or significance, as by a definition; not defined or explained: an undefined term.
What does it mean if an answer is undefined?
‘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.
What is an example of an undefined slope?
A good real life example of undefined slope is an elevator since an elevator can only move straight up or straight down. It got its name “undefined” from the fact that it is impossible to divide by zero. However, it is impossible to do 5/0 because there exist no number you can multiply 0 by to get 5.
What is an example of undefined?
An expression in mathematics which does not have meaning and so which is not assigned an interpretation. For example, division by zero is undefined in the field of real numbers.
Is a slope of 1 undefined?
A fraction with 0 as its denominator will always be undefined. Let’s look at the graph for x=1 and consider its slope. On the line below, no matter what the value of y, x is always equal to 1. This is true for any vertical line… the slope of the line will be undefined!