I have a javascript object:
[
{
"id":"123",
"name":"abc",
"email":"[email protected]"
},
{
"id":"465",
"name":"pqr",
"email":"[email protected]"
}
]
I want to concatenate all the names to a single string separated by a comma. I found a solution from https://stackoverflow.com/a/28474201 which concatenates all the keys but I want to concatenate only a specific key
You could map the names and join the array.
var data = [{ id: '123', name: 'abc', email: '[email protected]' }, { id: '465', name: 'pqr', email: '[email protected]' }],
names = data.map(o => o.name).join(',');
console.log(names);Generic solution , you pass any array and you pass the key of the object you want to fetch as comma separated string.
var givenArray = [ { 'id' : '123', 'name' : 'abc', 'email' : '[email protected]' }, { 'id' : '465', 'name' : 'pqr', 'email' : '[email protected]' } ];
function concatKey(data,key){
var result = data.map(obj => obj[key]).join(",");
return result;
};
console.log(concatKey(givenArray,'name'));Maybe, if the key is 'name' one possibile solutions is
const data = [ { 'id' : '123', 'name' : 'abc', 'email' : '[email protected]' }, { 'id' : '465', 'name' : 'pqr', 'email' : '[email protected]' } ];
const ret = data.map((el) => {
return el.name;
}).join(',');
If you want to make dinamically the key
function makeList(key) {
const data = [ { 'id' : '123', 'name' : 'abc', 'email' : '[email protected]' }, { 'id' : '465', 'name' : 'pqr', 'email' : '[email protected]' } ];
return data.map((el) => {
return el[key];
}).join(',');
}
I want to recommend Array.property.reduce(), this is code:
function mergeKey(list = [], key) {
return list.reduce((acc, cur) => {
acc += (acc ? ',' : '') + cur[key]
return acc;
}, '')
}
//test case
const data = [
{ 'id' : '123', 'name' : 'abc', 'email' : '[email protected]' },
{ 'id' : '465', 'name' : 'pqr', 'email' : '[email protected]' }
];
console.log(mergeKey(data, 'name'))
