I would like to extend the question that has been asked some time ago: How to get distinct values from an array of objects in JavaScript?
my case is very similar: I have the following:
var array =
[
{"name":"Doctor", "age":17},
{"name":"Doctor", "age":17},
{"name":"Doctor", "age":18},
{"name":"Nurse", "age":17},
{"name":"Nurse", "age": 35}
{"name":"Nurse", "age": 35}
]
What is the best way to be able to get an array of all of the distinct ages, but for chosen speciality such that I get an result array of:
filter by doctor parameter:
[17, 18]
filter by nurse parameter: [17, 35]
Use array functions
const array = [{
"name": "Doctor",
"age": 17
},
{
"name": "Doctor",
"age": 18
},
{
"name": "Nurse",
"age": 17
},
{
"name": "Nurse",
"age": 35
}
]
console.log(getUniqueAges(array, 'Doctor'))
console.log(getUniqueAges(array, 'Nurse'))
function getUniqueAges(data, name) {
return [...new Set(data
.filter(datum => datum.name === name)
.map(datum => datum.age))]
}just like in the answer you linked, but you filter (the example below is filtered by name==="doctor) the array before you pass it to the Set:
const data = [
{"name":"Doctor", "age":17},
{"name":"Doctor", "age":18},
{"name":"Nurse", "age":17},
{"name":"Nurse", "age": 35}
];
const unique = [...new Set(data.filter(item => item.name === "doctor").map(item => item.age))]; // [ '17', '18']