映射嵌套数组和 return 匹配的数组
Map an nested arrays and return matched ones
我知道,我已经看到了很多相同的问题,但无法得到完整的答案。
所以,我有一个类似这样的数组(为演示而简化):
// links.js
const links = [
{
name: 'Page 1',
path: '/page-1'
},
{
name: 'Page-2',
subpages:[
{ name: 'Page (2-1)', path: '/page-2-1' },
{ name: 'Page (2-2)', path: '/page-2-2' }
]
},
{
name: 'Page 3',
path: '/page-3'
},
{
name: 'Page 4',
subpages:[
{ name: 'Page (4-1)', path: '/page-4-1' },
{ name: 'Page (4-2)', path: '/page-4-2' },
{ name: 'Page (4-3)', path: '/page-4-3' }
]
},
...
]
export default links
上面的 object 是 menu-links 数据,我将它们呈现在屏幕上以便在页面之间导航,subpages
是下拉列表。它们有 path
或 subpages
,但不能同时有,并且可能有更多嵌套。
有 2 个任务我需要帮助。
第一个:
我网站的每个页面都有一个标题,其中大部分与上面显示的 name
属性 相同。
所以,我在每个页面上都呈现了一个函数,returns 当前路由的路径名,所以我想要的是通过 links
映射并获得 name
匹配的 path
.
例如,如果我给/page-4-1
,我想得到匹配路径的名称属性,那就是name: Page 4
第二
这一次,它有点像面包屑,如果我给 ['/page-1', '/page-2-1', '/page-4-2']
,我想得到:
[
{
name: 'Page 1',
path: '/page-1'
},
{
name: 'Page (2-1)',
path: '/page-2-1'
},
{
name: 'Page (4-2)',
path: '/page-4-2'
},
]
有些情况下可能没有匹配的结果,在这种情况下我想插入 {name: document.body.title, path: null}
我试过了
我正在使用 Nextjs
import { useRouter } from 'next/router'
import links from 'links.js'
const router = useRouter()
const splitted = router.asPath
.split('/')
.filter(
(sp) =>
sp !== ''
)
cost ready = []
for (let sp = 0; sp < splitted.length; sp++) {
for (let ln = 0; ln < links.length; ln++) {
if (links[ln].path) {
if (links[ln].path === '/' + splitted[sp]) {
ready.push(links[ln])
}
} else {
for (let sb = 0; sb < links[ln].sublinks.length; sb++) {
if (links[ln].sublinks[sb].path === '/' + splitted[sp]) {
ready.push(links[ln].sublinks[sb])
}
}
}
}
}
这部分工作但很混乱,map
、filter
和 find
应该有更好的方法,但我无法成功尝试它们。
提前感谢您的帮助!
编辑:
糟糕!我的问题有一个很大的错误, links
object 只包含 path
键,而不是条件 path
和 link
.
对于您的第一个问题,请尝试以下问题
const links = [
{
name: "Page 1",
path: "/page-1",
},
{
name: "Page-2",
subpages: [
{ name: "Page (2-1)", path: "/page-2-1" },
{ name: "Page (2-2)", path: "/page-2-2" },
],
},
{
name: "Page 3",
link: "/page-3",
},
{
name: "Page 4",
subpages: [
{ name: "Page (4-1)", link: "/page-4-1" },
{ name: "Page (4-2)", link: "/page-4-2" },
{ name: "Page (4-3)", link: "/page-4-3" },
],
},
];
// Find out function
// Level must 0 at beginning
function findout(pages, search, level = 0) {
for (const page of pages) {
if (page.link === search || page.path === search) {
if (level === 0) {
return page.name;
}
return true;
}
if (Array.isArray(page.subpages)) {
if (findout(page.subpages, search, level + 1)) {
if (level === 0) {
return page.name;
}
return true;
}
}
}
return false;
}
console.log(findout(links, "/page-4-3"))
第二题我建议这个
const links = [
{
name: "Page 1",
path: "/page-1",
},
{
name: "Page-2",
subpages: [
{ name: "Page (2-1)", path: "/page-2-1" },
{ name: "Page (2-2)", path: "/page-2-2" },
],
},
{
name: "Page 3",
link: "/page-3",
},
{
name: "Page 4",
subpages: [
{ name: "Page (4-1)", link: "/page-4-1" },
{ name: "Page (4-2)", link: "/page-4-2" },
{ name: "Page (4-3)", link: "/page-4-3" },
],
},
];
function findout2(pages, search, result = []) {
for (const page of pages) {
if (typeof page.link === "string" && search.includes(page.link)) {
result.push({ name: page.name, link: page.link });
} else if (typeof page.path === "string" && search.includes(page.path)) {
result.push({ name: page.name, path: page.path });
}
if (Array.isArray(page.subpages)){
findout2(page.subpages, search, result)
}
}
return result
}
console.log(findout2(links, ['/page-1', '/page-2-1', '/page-4-2']))
const links = [
{
name: 'Page 1',
path: '/page-1'
},
{
name: 'Page-2',
subpages:[
{ name: 'Page (2-1)', path: '/page-2-1' },
{ name: 'Page (2-2)', path: '/page-2-2' }
]
},
{
name: 'Page 3',
path: '/page-3'
},
{
name: 'Page 4',
subpages:[
{ name: 'Page (4-1)', path: '/page-4-1' },
{ name: 'Page (4-2)', path: '/page-4-2' },
{ name: 'Page (4-3)', path: '/page-4-3' }
]
},
];
const findPathObj = (path,links) => {
let result = null;
for(const item of links){
if(item.path == path) return item;
if(item.subpages) result = findPathObj(path, item.subpages)
if(result) break;
}
return result;
}
const findPageName = (path,links) => findPathObj(path,links)?.name;
const findBreadcrumb = (pathes, links) => pathes.map(path => findPathObj(path,links) || {name: document.title, path: null});
console.log(findPageName('/page-4-1', links));
console.log(findBreadcrumb(['/page-1', '/page-2-1', '/page-4-2'],links))
我知道,我已经看到了很多相同的问题,但无法得到完整的答案。
所以,我有一个类似这样的数组(为演示而简化):
// links.js
const links = [
{
name: 'Page 1',
path: '/page-1'
},
{
name: 'Page-2',
subpages:[
{ name: 'Page (2-1)', path: '/page-2-1' },
{ name: 'Page (2-2)', path: '/page-2-2' }
]
},
{
name: 'Page 3',
path: '/page-3'
},
{
name: 'Page 4',
subpages:[
{ name: 'Page (4-1)', path: '/page-4-1' },
{ name: 'Page (4-2)', path: '/page-4-2' },
{ name: 'Page (4-3)', path: '/page-4-3' }
]
},
...
]
export default links
上面的 object 是 menu-links 数据,我将它们呈现在屏幕上以便在页面之间导航,subpages
是下拉列表。它们有 path
或 subpages
,但不能同时有,并且可能有更多嵌套。
有 2 个任务我需要帮助。
第一个:
我网站的每个页面都有一个标题,其中大部分与上面显示的 name
属性 相同。
所以,我在每个页面上都呈现了一个函数,returns 当前路由的路径名,所以我想要的是通过 links
映射并获得 name
匹配的 path
.
例如,如果我给/page-4-1
,我想得到匹配路径的名称属性,那就是name: Page 4
第二
这一次,它有点像面包屑,如果我给 ['/page-1', '/page-2-1', '/page-4-2']
,我想得到:
[
{
name: 'Page 1',
path: '/page-1'
},
{
name: 'Page (2-1)',
path: '/page-2-1'
},
{
name: 'Page (4-2)',
path: '/page-4-2'
},
]
有些情况下可能没有匹配的结果,在这种情况下我想插入 {name: document.body.title, path: null}
我试过了
我正在使用 Nextjs
import { useRouter } from 'next/router'
import links from 'links.js'
const router = useRouter()
const splitted = router.asPath
.split('/')
.filter(
(sp) =>
sp !== ''
)
cost ready = []
for (let sp = 0; sp < splitted.length; sp++) {
for (let ln = 0; ln < links.length; ln++) {
if (links[ln].path) {
if (links[ln].path === '/' + splitted[sp]) {
ready.push(links[ln])
}
} else {
for (let sb = 0; sb < links[ln].sublinks.length; sb++) {
if (links[ln].sublinks[sb].path === '/' + splitted[sp]) {
ready.push(links[ln].sublinks[sb])
}
}
}
}
}
这部分工作但很混乱,map
、filter
和 find
应该有更好的方法,但我无法成功尝试它们。
提前感谢您的帮助!
编辑:
糟糕!我的问题有一个很大的错误, links
object 只包含 path
键,而不是条件 path
和 link
.
对于您的第一个问题,请尝试以下问题
const links = [
{
name: "Page 1",
path: "/page-1",
},
{
name: "Page-2",
subpages: [
{ name: "Page (2-1)", path: "/page-2-1" },
{ name: "Page (2-2)", path: "/page-2-2" },
],
},
{
name: "Page 3",
link: "/page-3",
},
{
name: "Page 4",
subpages: [
{ name: "Page (4-1)", link: "/page-4-1" },
{ name: "Page (4-2)", link: "/page-4-2" },
{ name: "Page (4-3)", link: "/page-4-3" },
],
},
];
// Find out function
// Level must 0 at beginning
function findout(pages, search, level = 0) {
for (const page of pages) {
if (page.link === search || page.path === search) {
if (level === 0) {
return page.name;
}
return true;
}
if (Array.isArray(page.subpages)) {
if (findout(page.subpages, search, level + 1)) {
if (level === 0) {
return page.name;
}
return true;
}
}
}
return false;
}
console.log(findout(links, "/page-4-3"))
第二题我建议这个
const links = [
{
name: "Page 1",
path: "/page-1",
},
{
name: "Page-2",
subpages: [
{ name: "Page (2-1)", path: "/page-2-1" },
{ name: "Page (2-2)", path: "/page-2-2" },
],
},
{
name: "Page 3",
link: "/page-3",
},
{
name: "Page 4",
subpages: [
{ name: "Page (4-1)", link: "/page-4-1" },
{ name: "Page (4-2)", link: "/page-4-2" },
{ name: "Page (4-3)", link: "/page-4-3" },
],
},
];
function findout2(pages, search, result = []) {
for (const page of pages) {
if (typeof page.link === "string" && search.includes(page.link)) {
result.push({ name: page.name, link: page.link });
} else if (typeof page.path === "string" && search.includes(page.path)) {
result.push({ name: page.name, path: page.path });
}
if (Array.isArray(page.subpages)){
findout2(page.subpages, search, result)
}
}
return result
}
console.log(findout2(links, ['/page-1', '/page-2-1', '/page-4-2']))
const links = [
{
name: 'Page 1',
path: '/page-1'
},
{
name: 'Page-2',
subpages:[
{ name: 'Page (2-1)', path: '/page-2-1' },
{ name: 'Page (2-2)', path: '/page-2-2' }
]
},
{
name: 'Page 3',
path: '/page-3'
},
{
name: 'Page 4',
subpages:[
{ name: 'Page (4-1)', path: '/page-4-1' },
{ name: 'Page (4-2)', path: '/page-4-2' },
{ name: 'Page (4-3)', path: '/page-4-3' }
]
},
];
const findPathObj = (path,links) => {
let result = null;
for(const item of links){
if(item.path == path) return item;
if(item.subpages) result = findPathObj(path, item.subpages)
if(result) break;
}
return result;
}
const findPageName = (path,links) => findPathObj(path,links)?.name;
const findBreadcrumb = (pathes, links) => pathes.map(path => findPathObj(path,links) || {name: document.title, path: null});
console.log(findPageName('/page-4-1', links));
console.log(findBreadcrumb(['/page-1', '/page-2-1', '/page-4-2'],links))