如何转换为高阶函数？

Question

我正在尝试将下面的内容转换为 HOF，但下面是我想出的最好的。结果是标准的。如何更好地使用函数式编程？

第一次尝试：

const privileges = {
        canAccessProject: 'Project',
        canAccessReport: 'Report'
    },
    licenses = {
        core: 'Core',
        review: 'Review'
    };

const getPrivileges = (access) => getPermissions(access, privileges);
const getLicenses = (access) => getPermissions(access, licenses);
const getPermissions = (access, entity) => Object.keys(access).map((p) => (access[p] ? entity[p] : '')).join(', ');

// output: "Project, Report"
console.log(getPrivileges({canAccessProject: true, canAccessReport; true })) 

// output: "Review"
console.log(getLicenses({review: true, core; false }))

第二次尝试：

const getPrivileges = (access) => getPermissions(access)(privileges)
const getLicenses = (access) => getPermissions(access)(licenses);
const getPermissions = (access) => (entity) => Object.keys(access).map((p) => (access[p] ? entity[p] : '')).join(', ');

Answer 1

好吧，getPermissions 可以将实体作为第一个参数，并且可以 return 一个采用 access 的函数然后：

 const getPermissions = (entity) => (access) => Object.keys(access).map((p) => (access[p] ? entity[p] : '')).join(', ');

 const getLicenses = getPermissions(licenses);

如何转换为高阶函数？

How to convert to Higher Order Function?

javascript

functional-programming

higher-order-functions