#0017
🎥 #0017 JavaScript Interview Question | #javascript #coding
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🔍 This question, frequently asked in technical interviews, explores the concept of Negation Operator and Boolean in JavaScript-
Negation Operator (!)
The negation operator (!) is a unary operator that takes a single operand and inverts its Boolean value. It converts truthy values to false and falsy values to true.
Truthy values are values that are considered true when evaluated in a Boolean context. Examples include non-zero numbers, non-empty strings, objects, and arrays.
Falsy values are values that are considered false when evaluated in a Boolean context. Examples include false, 0, "" (empty string), null, undefined, and NaN.
Operation:
!true results in false.
!false results in true.
Double Negation (!!)
Double negation (!!) is a common JavaScript idiom used to convert any value to its corresponding Boolean value. The first negation converts the value to its Boolean opposite, and the second negation converts it back to a true Boolean value.
Example:
!!true results in true.
!!false results in false.
!!0 results in false.
!!1 results in true.
!!"hello" results in true.
!!"" results in false.
Boolean
A Boolean in JavaScript is a data type that can hold one of two values: true or false. Booleans are often used in conditional statements to control the flow of a program.
Truthy and Falsy Values:
Truthy:
Non-zero numbers (e.g., 1, -1)
Non-empty strings (e.g., "hello")
Objects (e.g., {}, [])
Special values like Infinity and -Infinity
Falsy:
false
0
"" (empty string)
null
undefined
NaN
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