Question 206946 in Javascript Question posted in
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Javascript – how to get next key in json object

Trying to compare next json key with the current.

my json object is as below

table_0: {
TR4TD1: ‘Regionnn’,
TR4TD2: ‘Actual Generation (MU) during May n’,
TR4TD5: ‘Actual Generation (MU) duringnApril to Maynn’,
TR5TD2: ‘2019n’,
TR5TD3: ‘2018n’,
TR5TD4: ‘% Growthn’,
TR5TD5: ‘2019n’,
TR5TD6: ‘2018n’,
TR5TD7: ‘% Growth’
}

I am trying using the

Object.entries(obj).forEach(key, value)=>{

// here i want to access current key and next key

//for e.g. current key ‘TR4TD2’, next key ‘TR4TD5’

})

Tags:

2

Answers


  1. 0 
    const jsonObject = {
  table_0: {
    TR4TD1: 'Regionnn',
    TR4TD2: 'Actual Generation (MU) during May n',
    TR4TD5: 'Actual Generation (MU) duringnApril to Maynn',
    TR5TD2: '2019n',
    TR5TD3: '2018n',
    TR5TD4: '% Growthn',
    TR5TD5: '2019n',
    TR5TD6: '2018n',
    TR5TD7: '% Growth'
  }
};

const keys = Object.keys(jsonObject.table_0);

// Compare keys
for (let i = 1; i < keys.length; i++) {
  if (keys[i] === keys[i - 1]) {
    console.log(`Key ${keys[i]} matches the previous key.`);
  } else {
    console.log(`Key ${keys[i]} does not match the previous key.`);
  }
}

    use const keys = Object.keys(jsonObject.table_0); so that the statement return a set of keys then it is possible to iterate over the key and compare them too.

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  2. 0

    I think you can access the next item in a object by doing this:

    let current = 0

Object.entries(obj).forEach(key, value) => {
    const next = obj[key]

    // The current and next item are both accessible here
    // Note that the current item is 0 for the first key


    /* WRITE YOUR CODE HERE */

    current = obj[key]
})

    What the code is doing is it’s actually finding the previous and current variables, but treating them as the current and next. Hope this works for you.

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