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Combine two different arrays in JavaScript
Suppose we have two arrays, the first array contains the scheduled date for some events and the second array contains the names of those events, like this −
const dates = [
{
id:"1",
date:"2017-11-07"
},
{
id:"1",
date:"2017-11-08"
},
{
id:"2",
date:"2017-11-07"
},
{
id:"2",
date:"2017-11-08"
}
];
const names = [
{
id:"1",
name:"Pervies, Peter"
},
{
id:"2",
name:"Ming, Edmund"
}
];We are required to write a JavaScript function that takes in two such array and combines the event names with their corresponding dates based on the id property.
Therefore, for these arrays, the output should look like −
const output = [
{
id:"1",
name:"Pervies, Peter",
details:[
{date:"2017-11-07"},
{date:"2017-11-08"}
]
},
{
id:"2",
name:"Ming, Edmund",
details:[
{date:"2017-11-07"},
{date:"2017-11-08"}
]
}
]Example
The code for this will be −
const dates = [
{
id:"1",
date:"2017-11-07"
},
{
id:"1",
date:"2017-11-08"
},
{
id:"2",
date:"2017-11-07"
},
{
id:"2",
date:"2017-11-08"
}
];
const names = [
{
id:"1",
name:"Pervies, Peter"
},
{
id:"2",
name:"Ming, Edmund"
}
];
const combineArrays = (dates, names) => {
const res = [];
dates.forEach(el => {
const bool = !res.some(item => {
return item.id == el.id;
});
if(bool){
let combined = {};
combined.id = el.id;
combined.details = combined.details || [];
combined.details.push({
"date": el.date
});
res.push(combined);
}else{
res.find(item => {
return item.id === el.id;
})
.details.push({
"date": el.date
});
};
});
res.forEach(el => {
const bool = names.some(item => {
return item.id === el.id;
});
if(bool){
el.name = names.find(name => {
return name.id === el.id;
}).name;
};
});
return res;
};
console.log(JSON.stringify(combineArrays(dates, names), undefined, 4));Output
The output in the console −
[
{
"id": "1",
"details": [
{
"date": "2017-11-07"
},
{
"date": "2017-11-08"
}
],
"name": "Pervies, Peter"
},
{
"id": "2",
"details": [
{
"date": "2017-11-07"
},
{
"date": "2017-11-08"
}
],
"name": "Ming, Edmund"
}
]
Updated on: 12-Oct-2020
263 Views
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