Array's Method

filter

// Array's filter
const nums = [1,2,3,4,5,6,7];
let res = nums.filter(n => n>5);
console.log(res);

参考Medium: Map, Filter and Reduce – Animated

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过滤会员卡的选项的校验

let card = [
    {score: 60,valid: true},
    {store: 20,valid: false},
    {time: 23,valid: false},
    {name: "VIP",valid: true},
    {money: 100,valid: true}
]
// 将数据不合格的选项筛选出来
let checkRes = card.filter(item => !item.valid);
console.log(checkRes.length === 0?"校验通过":"数据不对")