Is null == undefined?
null is an assigned value. It means nothing. undefined means a variable has been declared but not defined yet.
What do you mean by null?
1 : having no legal or binding force : invalid a null contract. 2 : amounting to nothing : nil the null uselessness of the wireless transmitter that lacks a receiving station— Fred Majdalany. 3 : having no value : insignificant …
Is null and void?
Canceled, invalid, as in The lease is now null and void. This phrase is actually redundant, since null means “void,” that is, “ineffective.” It was first recorded in 1669.
Is NULL better than undefined?
null is a special value meaning “no value”. null is a special object because typeof null returns ‘object’. On the other hand, undefined means that the variable has not been declared, or has not been given a value.
Why is NULL used?
NULL values are used to indicate that you could have a value, but you don’t know what that value should be yet. They are placeholders until you finally collect the data needed to fill the table field with a real value. You should never confuse NULL values for zeros or blank strings.
What is the difference between null & undefined?
Many times we often get confused on what the difference between UNDEFINED and NULL is. Simply put, undefined means a variable has been declared but has not yet been assigned a value. … On the other hand, null is an object. It can be assigned to a variable as a representation of no value.
A null means absence of a value. In the above example, null is assigned to a variable myVar. It means we have defined a variable but have not assigned any value yet, so value is absence. If you try to find DOM element using document.
Why is null undefined?