第十周web作业3

Arrow function restore

var materials = [
  'Hydrogen',
  'Helium',
  'Lithium',
  'Beryllium'
];

console.log(materials.map(material => material.length));

写出这个的标准函数形式，就像下面这个形式一样
var selected = allJobs.filter(function (job) {
return job.isSelected();
};

var selected = allJobs.filter(job => job.isSelected());

标准函数形式：

var materials = [
  'Hydrogen',
  'Helium',
  'Lithium',
  'Beryllium'
];

console.log(materials.map(function(materils){
                    return materils.length()
})