I am working on below snippet :
let prevFilterName = ''
let filterCourse = ''
let filterIds = ['1','2','3','4','5','6','7','8','9']
let filterDetails = [
{
id: 1,
Name: 'David',
Course: 'English'
},
{
id: 2,
Name: 'Peter',
Course: 'German'
},
{
id: 3,
Name: 'Peter',
Course: 'React'
},
{
id: 4,
Name: 'John',
Course: 'English'
},
{
id: 5,
Name: 'John',
Course: 'NodeJs'
},
{
id: 6,
Name: 'John',
Course: 'Docker'
},
{
id: 7,
Name: 'Andrew',
Course: 'Dutch'
},
{
id: 8,
Name: 'Andrew',
Course: 'Angular'
},
{
id: 9,
Name: 'David',
Course: 'SQL'
}
]
filterIds.forEach((id) => {
let FindFilter = filterDetails.find((filterItem) => {return filterItem.id == id})
console.log(FindFilter);
if (prevFilterName == FindFilter.Name){
filterCourse = filterCourse + ',' + FindFilter.Course
}
else if (prevFilterName != FindFilter.Name){
filterCourse = filterCourse + FindFilter.Course + ' > '
}
prevFilterName = FindFilter.Name
console.log(filterCourse)
})
Output which I am expecting is :
English > German,React > English,NodeJs,Docker > Dutch,Angular,SQL
But I am getting output as below :
English > German > ,ReactEnglish > ,NodeJs,DockerDutch > ,AngularSQL >
Can someone help here to get it right?
When a difference is detected, you then do
filterCourse = filterCourse + FindFilter.Course + ' > '
You're putting the > in the wrong place - it needs to come between the previous element and the current one, not after both.
let prevFilterName="",filterCourse="",filterIds=["1","2","3","4","5","6","7","8","9"],filterDetails=[{id:1,Name:"David",Course:"English"},{id:2,Name:"Peter",Course:"German"},{id:3,Name:"Peter",Course:"React"},{id:4,Name:"John",Course:"English"},{id:5,Name:"John",Course:"NodeJs"},{id:6,Name:"John",Course:"Docker"},{id:7,Name:"Andrew",Course:"Dutch"},{id:8,Name:"Andrew",Course:"Angular"},{id:9,Name:"David",Course:"SQL"}];
filterIds.forEach((id) => {
let FindFilter = filterDetails.find((filterItem) => {
return filterItem.id == id
})
if (prevFilterName == FindFilter.Name) {
filterCourse = filterCourse + ',' + FindFilter.Course
} else if (prevFilterName && prevFilterName != FindFilter.Name) {
filterCourse = filterCourse + ' > ' +FindFilter.Course;
} else {
// initial
filterCourse = FindFilter.Course;
}
prevFilterName = FindFilter.Name
})
console.log(filterCourse)Another method, which I'd prefer - group the objects first, then join by the delimiter needed (, or >).
const filterDetails=[{id:1,Name:"David",Course:"English"},{id:2,Name:"Peter",Course:"German"},{id:3,Name:"Peter",Course:"React"},{id:4,Name:"John",Course:"English"},{id:5,Name:"John",Course:"NodeJs"},{id:6,Name:"John",Course:"Docker"},{id:7,Name:"Andrew",Course:"Dutch"},{id:8,Name:"Andrew",Course:"Angular"},{id:9,Name:"David",Course:"SQL"}];
let previousName;
const grouped = [];
for (const obj of filterDetails) {
if (obj.Name !== previousName) {
grouped.push([]);
}
grouped[grouped.length - 1].push(obj.Course);
previousName = obj.Name;
}
const result = grouped
.map(courses => courses.join(','))
.join(' > ');
console.log(result);