Discovering the worth of an array property in JavaScript

Question

Discovering the worth of an array property in JavaScript

I have a custom script that generates and outputs a JSON formatted object:

function test() {
    autoscaling.describeAutoScalingGroups(params, function(err, data) {
        if (err) console.log(err, err.stack); // an error occurred
        else console.log(JSON.stringify(data)); // successful response
    });
}

test();

The resulting JSON content is as follows:

{
  "ResponseMetadata": {
    "RequestId": "##################"
  },
  "AutoScalingGroups": [
    {
      "AutoScalingGroupName": "################",
      "AutoScalingGroupARN": "arn:aws:autoscaling:eu-west-1:#########:autoScalingGroup:###########",
      "LaunchConfigurationName": "######-LC-###########",
      "MinSize": 0,
      "MaxSize": 0,
      "DesiredCapacity": 0,
      "DefaultCooldown": 300,
      "AvailabilityZones": [
        "eu-west-1b",
        "eu-west-1c",
        "eu-west-1a"
      ],
      "LoadBalancerNames": [
        "#########-ELB-###########"
      ],
      "TargetGroupARNs": [

      ],
      "HealthCheckType": "ELB",
      "HealthCheckGracePeriod": 300,
      "Instances": [

      ],
      "CreatedTime": "2017-11-08T18:22:05.093Z",
      "SuspendedProcesses": [
        {
          "ProcessName": "Terminate",
          "SuspensionReason": "User suspended at 2017-11-08T18:22:14Z"
        }
      ],
      "VPCZoneIdentifier": "subnet-######,subnet-#######,subnet-#######",
      "EnabledMetrics": [

      ],
      "Tags": [
        {
          "ResourceId": "#######-ASG-##########",
          "ResourceType": "auto-scaling-group",
          "Key": "aws:cloudformation:logical-id",
          "Value": "ASG",
          "PropagateAtLaunch": true
        },
        {
          "ResourceId": "#######-ASG-#########",
          "ResourceType": "auto-scaling-group",
          "Key": "aws:cloudformation:stack-id",
          "Value": "arn:aws:cloudformation:eu-west-1:########:stack/##############",
          "PropagateAtLaunch": true
        },
        {
          "ResourceId": "################",
          "ResourceType": "auto-scaling-group",
          "Key": "aws:cloudformation:stack-name",
          "Value": "#######",
          "PropagateAtLaunch": true
        }
      ],
      "TerminationPolicies": [
        "Default"
      ],
      "NewInstancesProtectedFromScaleIn": false
    }
  ]
}

I am seeking to extract the value of

"SuspendedProcesses":[{"ProcessName"

: (refer above)

If the value of "ProcessName" == "Terminate" (as seen above), I want to execute one set of instructions; otherwise, another.

I understand how to structure the if-else statement, but I'm unsure about obtaining the value of "ProcessName" from the JSON output in advance.

While I confidently handle arrays created within a script, I'm encountering difficulty in this context because the JSON object is generated by the test() function, so conventional rules seem not to apply.

Your guidance on this matter would be greatly appreciated. Thank you.

javascript arrays json

Answer 1

Answer №1

To enhance your code, start by replacing console.log() statements with return statements. This will allow you to simplify the code as shown below:

var jsonData = fetchData();
var processes = jsonData["AutoScalingGroups"][0]["Suspended Processes"];

Here is the updated version of your code:

function fetchData() { 
    autoscaling.describeAutoScalingGroups(params, function(err, data) { 
        if (err) {
            return [err, err.stack]; // Handle error occurrence
        } else {
            var json = JSON.stringify(data);
            return json["AutoScalingGroups"][0]["Suspended Processes"];
        }
    }); 
} 

var processes = fetchData(); 
console.log(processes);

Answer 2

To enhance your code, start by replacing console.log() statements with return statements. This will allow you to simplify the code as shown below:

var jsonData = fetchData();
var processes = jsonData["AutoScalingGroups"][0]["Suspended Processes"];

Here is the updated version of your code:

function fetchData() { 
    autoscaling.describeAutoScalingGroups(params, function(err, data) { 
        if (err) {
            return [err, err.stack]; // Handle error occurrence
        } else {
            var json = JSON.stringify(data);
            return json["AutoScalingGroups"][0]["Suspended Processes"];
        }
    }); 
} 

var processes = fetchData(); 
console.log(processes);

Answer 3

Answer №2

hey @RobbieMilejczak, problem sorted:

To fix the issue, start by replacing all console.log() calls with return statements. Then proceed to execute

var jsonData = getTestData();
var services = jsonData["AutoScalingGroups"][0]["Suspended Processes"]
updated snippet:

function getTestData() { 
    autoscaling.describeAutoScalingGroups(params, function(error, response) { 
        if (error) {
            return [error, error.stack]; // an error occurred 
        } else {
            var jsonData = JSON.stringify(response); // successful response 
            return jsonData["AutoScalingGroups"][0]["Suspended Processes"];
        }
    }); 
} 
var services = getTestData()
console.log(services);

Answer 4

hey @RobbieMilejczak, problem sorted:

To fix the issue, start by replacing all console.log() calls with return statements. Then proceed to execute

var jsonData = getTestData();
var services = jsonData["AutoScalingGroups"][0]["Suspended Processes"]
updated snippet:

function getTestData() { 
    autoscaling.describeAutoScalingGroups(params, function(error, response) { 
        if (error) {
            return [error, error.stack]; // an error occurred 
        } else {
            var jsonData = JSON.stringify(response); // successful response 
            return jsonData["AutoScalingGroups"][0]["Suspended Processes"];
        }
    }); 
} 
var services = getTestData()
console.log(services);

Discovering the worth of an array property in JavaScript

Answer №1

Answer №2

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