有人可以告诉我我们如何使用此方法吗？

Question

let tool = '';

tool = 'marker';

// Use short circuit evaluation to assign writingUtensil variable below:
let writingUtensil = tool || 'pen';

console.log(`The ${writingUtensil} is mightier than the sword.`);

“与上述真实的虚假陈述有关的更多示例，请解释”