So, I ran into this problem while working on a project for a client. Basically I have an array with objects and an array of values, and I need to fill the array with objects, with objects for every item in the array. It's a little confusing to say, but here's the code and what the output should be:
// The Array, and the array with objects
var worksheet = [{"student_name": "Test 1", "file": "some_file_name.txt"}, {"student_name": "Test 3", "file": "file": "some_file_name.txt"}]
var data = {"student_names": ["Test 1", "Test 2", "Test 3", "Test 4"]}
The idea here, is to loop through data.student_names and append every student that isn't in worksheet,
// Output Should Be:
var worksheet = [
{"student_name": "Test 1", "file": "some_file_name.txt"},
{"student_name": "Test 3", "file": "some_file_name.txt"},
{"student_name": "Test 2", "file": ""}, // This wasn't here
{"student_name": "Test 4", "file": ""}, // This wasn't here
]
Concept
Iterate through the data.student_names and check if the name exists in the worksheet. If found, put the student object in foundArr; otherwise, store the student name with empty file in notFoundArr. Lastly, concatenate both arrays together to get the result.
Code
const worksheet = [{"student_name": "Test 1", "file": "some_file_name.txt"}, {"student_name": "Test 3", "file": "some_file_name.txt"}];
const data = {"student_names": ["Test 1", "Test 2", "Test 3", "Test 4"]};
let foundArr = [];
let notFoundArr = [];
data.student_names.forEach(s => {
let studentFound = worksheet.find(ws => ws.student_name === s);
if (studentFound !== undefined){
foundArr.push(studentFound);
}
else {
notFoundArr.push({"student_name": s, "file":""});
}
});
let result = foundArr.concat(notFoundArr);
console.log(result);const worksheet = [
{ 'student_name': 'Test 1', 'file': 'some_file_name.txt' },
{ 'student_name': 'Test 3', 'file': 'some_file_name.txt' }
]
const data = { 'student_names': [ 'Test 1', 'Test 2', 'Test 3', 'Test 4' ] }
const result = data['student_names']
.map(value => {
let record = worksheet.filter(item => item['student_name'] === value)
let file = record.length === 0 ? '' : record[0].file
return { 'student_name': value, 'file': file }
}
)
console.log(result)