a && b) evaluates to
false, then the second part of the expression is not evaluated. This means that if the left operand is a falsy value, then the operand on the right is never evaluated.
In cases where the expression short-circuit evaluates to
false, the operand that evaluated to
false is the one that is returned. To illustrate this, consider for example, the following:
console.log(false && true); // false console.log(1 && null && 'never reaches here'); // null console.log(.length && true); // 0
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