How Does JavaScript's Logical AND Operator Work in Assignments?

Logical AND Operator in JavaScript Assignment

In JavaScript, the logical OR operator (||) conditionally assigns a value based on the truthiness of an expression. It assigns the first non-null, non-undefined, and non-false expression to the variable.

However, the logical AND operator (&&) behaves differently in assignment scenarios. It evaluates the first expression as truthy or falsy.

Truthiness:

If the first expression is truthy, the logical AND operator returns the value of the second expression and assigns it to the variable:

var oneOrTheOther = true && "This is true"; // oneOrTheOther = "This is true"

Falsiness:

If the first expression is falsy, the logical AND operator returns the value of the first expression and assigns it to the variable:

var oneOrTheOther = false && "This is false"; // oneOrTheOther = false

Remember that falsy values in JavaScript include:

• null
• undefined
• 0
• NaN (Not-a-Number)
• "" (empty string)

Therefore, any assignment involving the logical AND operator and a falsy first expression will result in the assignment of that falsy value to the variable.

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