JSON.parse = How to return a value when another value is equal to something specific?

Question

Super new to JavaScript, but if I have If JSON payload looked like this:

{
'ProcessID' : '234928734'
    'Steps' :
      0 : {
              'Thisthing' : 'Hello'
              'Thatthing' : 'Yeah'
             }
       1 : {
              'Thisthing' : 'UseMe'
              'Thatthing' : 'ReturnMe'
             }
}

I want my javascript function to return the words "ReturnMe" because the parameter 'Thisthing' = 'UseMe'. I don't the values of 'Thatthing' returned unless the 'Thisthing' is 'UseMe'. I've tried JSON.parse() but I can only get the root values.

it looks like, you do not have a [JSON](https://json.org/) compliant string. just a plain object literal. please add your code. — Nina Scholz, Oct 16 '20 at 21:36
If the JSON is valid and the syntax in the question is just some issue with how you chose to put it in the question, then this is related to https://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json — Taplar, Oct 16 '20 at 21:43
The proper JSON object you mean to show is probably: `{"ProcessID":"234928734","Steps":{"0":{"Thisthing":"Hello","Thatthing":"Yeah"},"1":{"Thisthing":"UseMe","Thatthing":"ReturnMe"}}}`. — iAmOren, Oct 16 '20 at 21:59

score 0 · Accepted Answer · answered Oct 16 '20 at 21:58

Here is a proposition:

You must consider only the Steps object
From that object keep only values (at this stage you've got an Array)
Filter that array to keep only the object where 'Thisthing' === 'UseMe' (.filter returns an array of length === 1 hence the [0])
Read the property 'Thatthing'

function findMe(data) {

    const steps = data.Steps; // (1)

    return Object.values(steps) // (2)
        .filter(obj => obj.Thisthing === 'UseMe')[0] // (3)
        .Thatthing; // (4)

}

console.log(findMe({
    'ProcessID': '234928734',
    'Steps': {
        0: {
            'Thisthing': 'Hello',
            'Thatthing': 'Yeah'
        },
        1: {
            'Thisthing': 'UseMe',
            'Thatthing': 'ReturnMe'
        }
    }
}));

JSON.parse = How to return a value when another value is equal to something specific?

1 Answers1