I have an array of objects like below
var item = [
{ "name": "John", "age": 30, "city": "New York1" },
{ "name": "John1", "age": 31, "city": "New York2" },
{ "name": "John2", "age": 32, "city": "New York3" },
{ "name": "John3", "age": 31, "city": "New York3" }
]
What I want is to get some of the age from this array of objects which has age property value
in [30,31]
So basically the input will be an array of integers like var ageArray=[30,31];
Example :
Input : [30,31]
Output : Sum of the age
of the below objects
{ "name":"John", "age":30, "city":"New York1"},
{ "name":"John1", "age":31, "city":"New York2"},
{ "name":"John3", "age":31, "city":"New York3"}
So here it will be
92
I have tried to use filter for this but not sure how can i use filter
with contains
What I have tried is
var result = item .filter(obj => {
return obj.age..includes(ages);
})
Can someone help me to resolve this ?
Use Array#reduce
const items = [
{ "name":"John", "age":30, "city":"New York1"},
{ "name":"John1", "age":31, "city":"New York2"},
{ "name":"John2", "age":32, "city":"New York3"},
{ "name":"John3", "age":31, "city":"New York3"}]
const ages = [30, 31];
const res = items.reduce((sum, {age})=>{
return sum + (ages.includes(age) ? age : 0);
}, 0);
console.log(res);
Modified for names:
const items = [
{ "name":"John", "age":30, "city":"New York1"},
{ "name":"John1", "age":31, "city":"New York2"},
{ "name":"John2", "age":32, "city":"New York3"},
{ "name":"John3", "age":31, "city":"New York3"}]
const names = ["John", "john1"].map(n=>n.toLowerCase());
const res = items.reduce((sum, {name, age})=>{
return sum + (names.includes(name.toLowerCase()) ? age : 0);
}, 0);
console.log(res);
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