8個(gè)常用的JavaScript數(shù)組方法

const students = [    { name: 'Alice', score: 100 },    { name: 'Bob', score: 90 },    { name: 'Trunp', score: 80 },    { name: 'Biden', score: 70 },    { name: 'Joe', score: 60 },    { name: 'Sunshine', score: 50 },    { name: 'Elon', score: 40 },    { name: 'Jack', score: 30 },];

1、filter

//返回成績(jī)大于75的高分學(xué)生const highScores = students.filter(stu => stu.score > 75);console.log(highScores);

[    { name: 'Alice', score: 100 },    { name: 'Bob', score: 90 },    { name: 'Trunp', score: 80 }]

2、map

//返回全部對(duì)象的name屬性const names = students.map(stu => stu.name);console.log(names);

[ 'Alice','Bob', 'Trunp','Biden','Joe', 'Sunshine','Elon','Jack']

3、find

//返回name長(zhǎng)度為4的第一個(gè)對(duì)象const foundedOne = students.find(stu=>stu.name.length === 4);console.log(foundedOne);

{ name: 'Elon', score: 40 }

4、forEach

//打印元素students.forEach(item=>console.log(`stu-name=${item.name},stu-score=${item.score}`));

stu-name=Alice,stu-score=100stu-name=Bob,stu-score=90stu-name=Trunp,stu-score=80stu-name=Biden,stu-score=70stu-name=Joe,stu-score=60stu-name=Sunshine,stu-score=50stu-name=Elon,stu-score=40

5、some

//是否至少有一個(gè)name為Jack的const isSome = students.some(item=>item.name === 'Jack');console.log(isSome);

6、every

//是否score都大于70const isEvery = students.every(item=>item.score > 70);console.log(isEvery);

7、reduce

//求取全部score之和const result = students.reduce(    (accumulator, current) => accumulator + current.score,    0);console.log(result);

8、includes

const isIncludes = students.includes({ name: 'Jack', score: 30 });console.log(isIncludes);