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Create array from JSON object JavaScript
Suppose, we have the following JSON object −
const obj = {
"test1": [{
"1": {
"rssi": -25,
}
}, {
"2": {
"rssi": -25,
}
}],
"test2": [{
"15": {
"rssi": -10,
} }, {
"19": {
"rssi": -21,
}
}]
};We are required to write a JavaScript function that takes in an object like this −
The function should then map the "rssi" property of all the nested objects to a corresponding nested array of arrays.
Therefore, for the above array, the output should look like this −
const output = [[-25, -25], [-10, -21]];
Example
const obj = {
"test1": [{
"1": {
"rssi": -25,
}
}, {
"2": {
"rssi": -25,
}
}],
"test2": [
{
"15":
{ "rssi": -10,
}
}, {
"19": {
"rssi": -21,
}
}]
};
const mapToValues = (object = {}) => {
const res = [];
for (let key in object) {
let obj = object[key];
let aux = [];
for (let i = 0; i < obj.length; i++) {
for (x in obj[i]) {
aux.push(obj[i][x].rssi);
}
}
res.push(aux);
}
return res;
};
console.log(mapToValues(obj));Output
And the output in the console will be −
[ [ -25, -25 ], [ -10, -21 ] ]
Updated on: 21-Nov-2020
935 Views
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