javascript - 从对象数组中获取值

Question

我正在循环遍历数组以获取相应的字段值:

var someFun = function (nm) {
    var names = [{name: 'joe', age: 'nine'}, {name: 'tom', age: 'ten'}];

    for (var i=0; i < names.length; i++) {
        if (names[i].name === nm) return names[i].age;
    }
};

var username = 'tom';
var printme = someFun(username);
console.log('hey: ', printme)

如何使用 Object.keys()、map 或 forEach 执行相同操作？更加干净并且符合 ES6 标准。

Answer 1

只需使用查找

([{name: 'joe', age: 'nine'}, {name: 'tom', age: 'ten'}].find( (s)=> s.name=="tom" )||{}).age //10

([{name: 'joe', age: 'nine'}, {name: 'tom', age: 'ten'}].find( (s)=> s.name=="tom2" )||{}).age //undefined

演示

var names = [{
  name: 'joe',
  age: 'nine'
}, {
  name: 'tom',
  age: 'ten'
}];

function getAge(names, name) {
  return (names.find((s) => s.name == name) || {}).age;
}

console.log(getAge(names, "tom"))
console.log(getAge(names, "tom2"))