将Nodejs JSON object 转换为列表<string></string>

Question

I am new to NodeJS - I am doing this in a AWS lambda function and have the below JSON object

{
  "subnetsToUse": [
    {
      "subnetId": "subnet-0g6e5ad78f2841dc9"        },
    {
      "subnetId": "subnet-089e0d4de075664b3"        },
    {
      "subnetId": "subnet-06778539a55adc513"        }
  ]
}

I need to return a list of subnetIds from this.

subnet-0g6e5ad78f2841dc9,subnet-0g6e5ad78f2841dc9,subnet-0g6e5ad78f2841dc9

Here is what I have tried so far

var objectKeysArray = Object.keys(subnetsToUse) 
objectKeysArray.forEach(function(subnetId) 
{ var objValue = subnetsToUse[subnetId] })

How do I achieve this in NodeJS.

Answer 1

You can use the Array.map or Array.reduce to iterate over the object values and push them into an array for example.

 const data = { "subnetsToUse": [ { "subnetId": "subnet-0g6e5ad78f2841dc9", "availabilityZone": "us-west-2c" }, { "subnetId": "subnet-089e0d4de075664b3", "availabilityZone": "us-west-2b" }, { "subnetId": "subnet-06778539a55adc513", "availabilityZone": "us-west-2a" } ] } const mapRes = data.subnetsToUse.map((currentValue) => { return currentValue.subnetId; }); console.log("mapRes", mapRes) const reduceRes = data.subnetsToUse.reduce((accumulator, currentValue) => { accumulator.push(currentValue.subnetId); return accumulator; }, []); console.log("reduceRes",reduceRes)