如何解决我想用split方法分开并在javascript中映射一个对象
您好,我想帮我如何用split分离一个数组,该数组的对象具有其属性为空的名称course1,course2和course3。具有文本且内容中带有符号+的课程将其与split属性分隔成一个数组,然后封装在一个名为Courses的对象数组中,并将其课程标识符,学分和注释放到每个课程对象中,最后显示出来作为对象的原始数组。
请帮助我,谢谢。
我在这里编写代码,但对我来说不起作用
//this is my array
var alumno: [
{
'name' : 'ivan hambi apaza','course1' : 'HISTORIA DE LA DANZA+2+16','course2' : 'HISTORIA+3+17','course3' : '',}
],//a step that I was doing but it does not come out
alumnoN(){
var newArr = [...this.alumno]
newArr.map(el => {
return el.course1 = el.course1.split('+')
})
newArr.map(el => {
return el.course2 = el.course2.split('+')
})
newArr.map(el => {
return el.course3 = el.course3.split('+')
})
return newArr
}
console.log(alumnoN())
因此,我想要一个这样的对象:
[
{
'name':'ivan hambi apaza','courses':[
{'course':'HISTORIA DE LA DANZA','credit':2,'note':16},{'course':'HISTORIA','credit':3,'note': 17},]
}
]
解决方法
我相信这应该可以满足您的要求。
function splitAlumno(alumno) {
let finalList = [];
for(let i=0;i<alumno.length;i++) {
let object = alumno[i];
let formattedObject = {
name : object.name,courses : []
};
delete object.name;
Object.keys(object).forEach(v => {
if(object[v].trim().length === 0) return;
let data = object[v].split('+');
let course = {
course: data[0],credit: data[1] ? data[1] : "",note: data[2] ? data[2] : ""
};
formattedObject.courses.push(course);
});
finalList.push(formattedObject);
}
return finalList;
}
let alumno = [
{
'name' : 'ivan hambi apaza','course1' : 'HISTORIA DE LA DANZA+2+16','course2' : 'HISTORIA+3+17','course3' : '',}
];
console.log(splitAlumno(alumno));
,
尝试一下此代码。使用一些不错的ES6功能(解构,对象属性值简写):
// 'HISTORIA DE LA DANZA+2+16' => {'course':'HISTORIA DE LA DANZA','credit':2,'note':16}
function c2c(c) {
if (c.length === 0) return null
var [course,credit,note] = c.split("+")
return {course,note}
}
// {name:...,course1:...,course2:...,...} => ['HISTORIA DE LA DANZA+2+16',...]
function o2cs(o) {
// return [o.course1,o.course2,o.course3] // sufficient ???
var ret = []
for (var k in o) {
if (k.startsWith("course")) ret.push(o[k])
}
return ret
}
// main object conversion function
function a2a(o) {
var courses = o2cs(o) // extract courses from o
courses = courses.map(c2c) // convert strings to objects
courses = courses.filter(Boolean) // filter non-null courses
return {name: o.name,courses: courses}
}
// main function,just maps the array
function alumnoN(alumno) { return alumno.map(a2a) }
// test
var alumno = [
{
'name' : 'ivan hambi apaza',},]
console.log(alumnoN(alumno))
console.log(alumnoN(alumno)[0].courses)
,
您可以使用flatMap
和reduce
以及自定义函数来返回课程对象
var alumno = [ { name: "ivan hambi apaza",course1: "HISTORIA DE LA DANZA+2+16",course2: "HISTORIA+3+17",course3: "",} ];
getspliob = (course) =>
/\+/g.test(course) // test if course includes +
? ((ob = course.split("+")),// split and get the array
{ course: ob[0],credit: ob[1] || "0",note: ob[2] || "0" }) // build object
: { course: course,credit: 0,note: 0 }; // else return default object
res = alumno.flatMap(({ name,course1,course2,course3 }) => //map the alumno array
Object.values(
[course1,course3].reduce( // use reduce on courses
(r,o) => (
o != "" // check if course is not empty string
? !r[name] // check if object doesn't exist in accumulator r
? (r[name] = { ...r[name],name: name,courses: [getspliob(o)] }) // then build object
: r[name].courses.push(getspliob(o)) // else push to the already existing courses array
: r,r // return accumulator
),{}
)
)
);
console.log(res);
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