JavaScript: Extract values of a specific key out of key-value array and store them in a new array-CodePudding

I have an' multidimensional key-value array like this:

'[[
{"_time":"2022-01-03T00:00:00Z","_value":10.70140000000014,"ts":1641168000000},
{"_time":"2022-01-04T00:00:00Z","_value":13.002499999999767,"ts":1641254400000},
{"_time":"2022-01-05T00:00:00Z","_value":16.171700000000182,"ts":1641340800000},
{"_time":"2022-01-06T00:00:00Z","_value":17.48929999999981,"ts":1641427200000},
]]'

and I need the values from each of them in a new variable in this way:

[10.70140000000014,13.002499999999767,16.171700000000182,17.48929999999981]

I tried it with map but that do not match my needs:

function getPreparedData(data) {
  if (data) {
  return data[0].map(elm => ({
      a: elm._value
  }));
  }
   return [];
};

How can I solve this?

Thanks

Frank

CodePudding user response：

In your example, the function getPreparedData is returning array of objects. You actually want to return an array of values (where values are just the value of the _value property)

const data = [[
{"_time":"2022-01-03T00:00:00Z","_value":10.70140000000014,"ts":1641168000000},
{"_time":"2022-01-04T00:00:00Z","_value":13.002499999999767,"ts":1641254400000},
{"_time":"2022-01-05T00:00:00Z","_value":16.171700000000182,"ts":1641340800000},
{"_time":"2022-01-06T00:00:00Z","_value":17.48929999999981,"ts":1641427200000},
]];

function getPreparedData(data) {
  return data[0].map(elm => elm._value)
};

const res = getPreparedData(data);
console.log(res);