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What is the difference between undefined and null in JavaScript?

Sanjay Dixit

Sanjay Dixit
12y
1.4k
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    Bidyasagar Mishra

    if we declare but not use then its undefined if we didnot declare then its null

    Bidyasagar Mishra
    6y
    0
    Guru Bandgar
    1. console.log(a); /* undefined */var b;2. console.log(b); /* null */
    Guru Bandgar
    9y
    0
    Abhijeet Gupta
    In JavaScript, undefined means a variable has been declared but has not yet been assigned a value, null is an assignment value. It can be assigned to a variable as a representation of no value:
    Abhijeet Gupta
    10y
    0
    Jaganathan Bantheswaran
    undefined is a type itself (undefined) while null is an object.
    Jaganathan Bantheswaran
    11y
    0
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