es6 findIndex , find用法

let arr = [
    {name:'test1',age:1},
    {name:'test2',age:2},
    {name:'test3',age:3}
]

let temp = arr.findIndex(function(item){
    console.log(item.name)
    return item.name == 'test3'// 这里return不可少,必须“==”
})
console.log('temp=',temp)


// var arr = [12, 16, 18, 20]
// let index = arr.findIndex(item => item == 16)
// console.log('index=',index)//1

let arr = [
    {name:'test1',age:1},
    {name:'test2',age:2},
    {name:'test3',age:3}
]

// 需求:获取name=test3的元素下标
var index = arr.findIndex(item => {return item.name == 'test3'})
console.log(index)

// 需求:获取name=test3的元素
var obj = arr.find(item => {return item.name == 'test3'})
console.log(obj)

• tips:find方法---如果没有找到，返回undefined