I got object array like this:
const matches = [
{
homeTeam: 'France',
awayTeam: 'Croatia',
score: '2:1',
date: '18.01.2019'
},
I need to add one more object "Points" to this array and initialize it to 0.
I expect to add this object and print it to console
let matches = [{
homeTeam: 'France',
awayTeam: 'Croatia',
score: '2:1',
date: '18.01.2019'
}]
let newArrayWithPoints = matches.map(o => ({ ...o,
Points: 0
}))
console.log('newArrayWithPoints', newArrayWithPoints)since its an array of objects you can create a new property by looping through it and return a new copy of array using array.map
i hope this will solve the issue
let newArrayWithPoints = matches.map(o => ({...o, Points: 0}))
Try map method from array.prototype.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map
matches.map(col => col.Points = 0)
You can use below if you need ES5 syntax means you're on web browser.
matches.map(function() {
return col.Points = 0
})
The point of changes are using return statement to set value.
If you want to add at the time of initialization use
const matches = [
{
homeTeam: 'France',
awayTeam: 'Croatia',
score: '2:1',
date: '18.01.2019'
},{ points: 0 }]
but if you want to add after initialization, don't make it constant variable and use push method .
Am I missing some complexity? - - simply target the object in the array and set the property.
let matches = [{
homeTeam: 'France',
awayTeam: 'Croatia',
score: '2:1',
date: '18.01.2019'
}]
matches[0].points = 0;
console.log(matches)
//[
// {
// "homeTeam": "France",
// "awayTeam": "Croatia",
// "score": "2:1",
// "date": "18.01.2019",
// "points": 0
// }
//]If there are multiple matches in the array - simply iterate over the array and do the same.
let matches = [
{
homeTeam: 'France',
awayTeam: 'Croatia',
score: '2:1',
date: '18.01.2019'
},{
homeTeam: 'Italy',
awayTeam: 'Germany',
score: '2:0',
date: '9.06.2019'
}]
matches.forEach(function(match){
match.points = 0;
})
console.log(matches)
//[
// {
// "homeTeam": "France",
// "awayTeam": "Croatia",
// "score": "2:1",
// "date": "18.01.2019",
// "points": 0
// },
// {
// "homeTeam": "Italy",
// "awayTeam": "Germany",
// "score": "2:0",
// "date": "9.06.2019",
// "points": 0
// }
]//