ES6 面试题与答案
问题 26. Explain the 'Array.includes()' method in ES6.
Array.includes() is used to check if an array includes a certain element, returning true or false.
Example:
const numbers = [1, 2, 3, 4, 5]; const includesThree = numbers.includes(3);
这有帮助吗？
添加评论
查看评论
问题 27. What is the 'Object.entries()' method in ES6?
Object.entries() is used to return an array of a given object's own enumerable string-keyed property [key, value] pairs.
Example:
const obj = { a: 1, b: 2 }; const entries = Object.entries(obj);
这有帮助吗？
添加评论
查看评论
问题 28. Explain the 'Object.keys()' method in ES6.
Object.keys() is used to return an array of a given object's own enumerable string-keyed property names.
Example:
const obj = { a: 1, b: 2 }; const keys = Object.keys(obj);
这有帮助吗？
添加评论
查看评论
问题 29. What is the purpose of the 'Object.values()' method in ES6?
Object.values() is used to return an array of a given object's own enumerable string-keyed property values.
Example:
const obj = { a: 1, b: 2 }; const values = Object.values(obj);
这有帮助吗？
添加评论
查看评论
问题 30. Explain the concept of the 'for...of' loop in ES6.
The 'for...of' loop is used to iterate over values in an iterable object, such as an array, string, or Map.
Example:
const arr = [1, 2, 3]; for (const num of arr) { console.log(num); }
这有帮助吗？
添加评论
查看评论
用户评价最有帮助的内容：