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javascriptlogical-operatorslogical-and
Prakhar Tripathi
Prakhar Tripathi

Reputation: 31

Why does the following expression in Javascript with logical AND operator is giving syntax Error?

While the expression is evaluating as expected for 1 && {} giving {} as the answer, however when I flip the operands to make it {} && 1 it gives syntax error.

452:1 Uncaught SyntaxError: Unexpected token '&&'

I was expecting 1 as the result in the latter case. The same behavior is replicated with the || (OR) operator.

Upvotes: 0

Views: 93

Answers (1)

Safal Pokharel
Safal Pokharel

Reputation: 1

  1. 1 && {}: In this case, 1 is a truthy value, so the evaluation continues to the second operand, {}. Since {} is an object and is considered truthy, the result of the expression is {}.

  2. {} && 1: Here, {} is an object and is considered truthy, so the first operand is truthy. However, when it comes to the second operand, 1, there is a syntactical issue. In JavaScript, the logical AND operator (&&) expects both operands to be expressions or values that can be evaluated. However, 1 is a single token, and it cannot be used as an operand for the logical AND operator without wrapping it in parentheses. Hence, you're seeing a syntax error.

Upvotes: -5

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