Push object into an array

Question

I have requirement like need to form object as below

[
 {
 "place": "Royal Palace, Oslo",
 "latitude" : "59.916911"
 },
 {
 "place": "Royal Palace, Oslo",
 "latitude" : "59.916911"
 }
]

the above place and latitude values are available within map function as

let sampleArray = [];
jsonresponse.map((item) => {
 let place = item.place;
 let latitude = {/*with other logic function we will get latitude value*/}
 //need to send these both values into below array to form array shown as above.
 sampleArray.push();
})

thanks in advance.

• 3Dos: What is the question exactly ?
• Mörre: "How do I push an object into an array" is a little too basic for an SO question. The answer is: "Just do it." I mean, you even wrote the desired target array format down already. Weird question... Also, I fail to see any connection to "react" or "react-native" - I removed those tags.

Answer 1

You are using the map function wrong. In a map function, you create a new array in which for each value the return value replaces the current value. Your function isn't returning new values, and isn't pushing anything to the array. So you have 2 options:

//FIRST OPTION
const sampleArray = jsonResponse.map(({ place } => ({
 place,
 latitude: [SOME_VALUE]
}))
//SECOND OPTION
const sampleArray = [];
jsonresponse.forEach(({ place }) => {
 sampleArray.push({
 place,
 latitude: [SOME_VALUE]
 })
}) 

Also, notice the es6 destructuring syntax, it could save you some code.

Answer 2

All you need to do with Array.prototype.map is:

let sampleArray = jsonresponse.map((item) => {
 let place = item.place;
 let latitude = {/*with other logic function we will get latitude value*/}
 return {
 place,
 latitude
 }
})

Answer 3

Is this what you want to accomplish ?

let sampleArray = []
jsonresponse.map(item => {
 sampleArray.push({
 place: item.place,
 latitude: {/*with other logic function we will get latitude value*/}
 })
})
console.log(sampleArray)

• Mörre: @VenuuMunnuruu Look at the other responses, don't use map for this! 3Dos just asked to clarify what you want, you should not actually do what you did.