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Javascript boolean operators

The and-operator (&&) and the or-operator (||) employ short-circuiting to prevent unnecessary work if the outcome of the operation does not change with the extra work.

In x && y, y will not be evaluated if x evaluates to false, because the whole expression is guaranteed to be false.

In x || y, y will not be evaluated if x evaluated to true, because the whole expression is guaranteed to be true.

Example


function T() { // True
 console.log("T");
 return true;
}
function F() { // False
 console.log("F");
 return false;
}

Example1


T() && F();

Output

'T'
'F'

Example 2


F() && T();

Output

'F'

Example 3


T() || F();

Output

'T'

Example 4


F() || T();

Output

'F'
'T'



Conclusion

In this page (written and validated by ) you learned about Javascript boolean operators . What's Next? If you are interested in completing Javascript tutorial, your next topic will be learning about: Javascript Null and Undefined.



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