Is there a way to extract messages based on keywords from a JSON structure? Here is an example of the JSON structure:
[{ _id: 123, message: 'hello', username: '1' }, { _id: 456, message: 'world', username: '2'}]I would like to retrieve all the messages and store them in an array using JavaScript. How can this be achieved? Thank you.
const data = [{ _id: 123, message: 'hello', username: '1' }, { _id: 456, message: 'world', username: '2'}];
var newArray = [];
for(let i=0;i<data.length;i++) {
newArray.push(data[i].message);
}
console.log(newArray);If you want to extract the message property from each object in an array, you can either use Array.map() or loop through the array and push the messages to a new array.
var arr = [{ _id: 123, message: 'hello', username: '1' }, { _id: 456, message: 'world', username: '2'}];
var newArr = arr.map(function(obj){
return obj.message;
});
console.log(newArr);To achieve this, utilize the Array#map method along with ES6 arrow functions.
var data=[{ _id: 123, message: 'hello', username: '1' }, { _id: 456, message: 'world', username: '2'}];
var res = data.map(v => v.message);
console.log(res);If you prefer using traditional functions instead of arrow functions:
var data=[{ _id: 123, message: 'hello', username: '1' }, { _id: 456, message: 'world', username: '2'}];
var res = data.map(function(v){
return v.message;
});
console.log(res);This solution is universal
let originalArray = [{ _id: 123, message: 'hello', username: '1' }, { _id: 456, message: 'world', username: '2'}]
let modifiedArray = [];
for(let i=0; i<originalArray.length; i++){
modifiedArray.push(originalArray[i].message)
}
console.log(modifiedArray)
Alternatively, a more concise version of the above code would be:
let initialArr = [{ _id: 123, message: 'hello', username: '1' }, { _id: 456, message: 'world', username: '2'}],
newArr = [];
for (let i = 0; i < initialArr.length; i++) newArr.push(initialArr[i].message);
console.log(newArr);
Another option is to utilize JsonPath:
var data = jsonPath(yourDataArray, "$..data");
In my view, this is one of the simplest methods for locating information in json.
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