var students = ["Malcom", "Jayne"];
var persons = [
{firstname : "Malcom", lastname: "Reynolds"},
{firstname : "Kaylee", lastname: "Frye"},
{firstname : "Jayne", lastname: "Cobb"}
];
I want to filter(or map, forEach whatever) persons array with students array. Students array is dynamic, so its length can be changed.
Any ideas?
It can be done with filter along with some.
var students = ["Malcom", "Jayne"];
var persons = [
{firstname : "Malcom", lastname: "Reynolds"},
{firstname : "Kaylee", lastname: "Frye"},
{firstname : "Jayne", lastname: "Cobb"}
];
console.log(persons.filter(person => students.some(student => student == person.firstname)))
// An advice, maybe you want to put everything to lower case
// to prevent a wrong result because of case mismatch
// (e.g. "Malcom" !== "malcom").
// It would be:
persons.filter(person => students.some(student => student.toLowerCase() === person.firstname.toLowerCase()))You could use Set and Array#filter.
var students = ["Malcom", "Jayne"],
persons = [{ firstname: "Malcom", lastname: "Reynolds" }, { firstname: "Kaylee", lastname: "Frye" }, { firstname: "Jayne", lastname: "Cobb" }],
result = persons.filter(function (a) {
return this.has(a.firstname);
}, new Set(students));
console.log(result);ES6
var students = ["Malcom", "Jayne"],
persons = [{ firstname: "Malcom", lastname: "Reynolds" }, { firstname: "Kaylee", lastname: "Frye" }, { firstname: "Jayne", lastname: "Cobb" }],
result = persons.filter((set => a => set.has(a.firstname))(new Set(students)));
console.log(result);You should be able to filter the array by checking if their firstname is in the students array:
persons.filter(function(person) { return students.indexOf(person.firstname) >= 0 });
For this you can use filter() and includes()
var students = ["Malcom", "Jayne"];
var persons = [
{firstname : "Malcom", lastname: "Reynolds"},
{firstname : "Kaylee", lastname: "Frye"},
{firstname : "Jayne", lastname: "Cobb"}
];
var r = persons.filter(function(o) {
return students.includes(o.firstname);
});
console.log(r)
includesvar students = ["Malcom", "Jayne"];
var persons = [
{firstname : "Malcom", lastname: "Reynolds"},
{firstname : "Kaylee", lastname: "Frye"},
{firstname : "Jayne", lastname: "Cobb"}
];
var filteredPersons = persons.filter(person => students.indexOf(person.firstname) > -1);
