Question 109976 in Json Question posted in
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Json – How to extract specific value from each element of an array and turn them into an array of object?

I want to extract the name and rate from each element of the array below, and turn them into an array of object

[
  'BTCUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3000% / -0.3000%t0.3000% / -0.3000%',
  'ETHUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%',
  'BCHUSDT Perpetualt8ht05:14:44t-0.0135%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%'
]

The following is what i expect to get:

[
{"name":BTCUSDT, "rate":0.01%},
{"name":ETHUSDT,"rate":0.01%},
{"name":BCHUSDT,"rate":0.01%},
]

Appreciate for any suggestions.

Tags:

3

Answers


  1. 0

    Try using arr.reduce()

    const arr = [
  'BTCUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3000% / -0.3000%t0.3000% / -0.3000%',
  'ETHUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%',
  'BCHUSDT Perpetualt8ht05:14:44t-0.0135%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%'
];

const res = arr.reduce((acc, item) => {
  debugger;
  const splitArr = item.split(' ');
  acc.push({
    [splitArr[0]]: splitArr[1].split('t')[4]
  });
  return acc;
}, [])

console.log(res)
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  2. 0

    You can use a combination of array mapping and string splitting to achieve this:

    const arr = [
  'BTCUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3000% / -0.3000%t0.3000% / -0.3000%',
  'ETHUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%',
  'BCHUSDT Perpetualt8ht05:14:44t-0.0135%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%'
];

const result = arr.map(item => {
  const elements = item.split('t');
  const name = elements[0].split(" ")[0];
  return {
    name,
    rate: elements[4]
  };
});

console.log(result);
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  3. 0 
    const arr = [
  'BTCUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3000% / -0.3000%t0.3000% / -0.3000%',
  'ETHUSDT Perpetualt8ht05:14:44t0.0100%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%',
  'BCHUSDT Perpetualt8ht05:14:44t-0.0135%t0.01%t0.3750% / -0.3750%t0.3750% / -0.3750%'
];
var data = [];
const result = arr.reduce((data, value) => {
  const splitArray = value.split(' ');
  var params = {
    name: splitArray[0],
    rate: splitArray[1].split('t')[4]
  }
  data.push(params);
  return data;
}, [])

const output = result;
console.log(output);
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