Boolean (Logical type)
The Boolean data type is broken up only into two values: true and false. This is intended to store “yes” and “no” values by using “true” for “yes” and “false” for “no”, making it easier for the computer application to read commands. Boolean values can also respond to numerical values and equations, such as 4 > 1, which would be false. “On” and “off” can also be interpreted for “true” and “false” for special commands.
The “Null” Value
The “Undefined” Value
Alert(age); // shows “undefined”
“Undefined” results out the fact that the age was not assigned a numerical value nor a “null” value. “Undefined” is predominantly used for a default value when things are unassigned.
Objects and Symbols
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