CODEWITHSUNDEEP
javascriptarraystypescript
Gyuzal
Gyuzal

Reputation: 1591

Javascript/Typescript update data from one nested array in another

My initial array is like this:

 preData = [
    ['APP_NOT_RUNNING', 0],
    ['FALLBACK', 0],
    ['IDLE', 0],
    ['OUTOFSERVICE', 0]
];

The array with values is like this:

preData = [
    ['APP_NOT_RUNNING', 2],
    ['IDLE', 3],
];

I would like to update the values of first array from the second one, the result:

  finalData= [
        ['APP_NOT_RUNNING', 2],
        ['FALLBACK', 0],
        ['IDLE', 3],
        ['OUTOFSERVICE', 0]
    ];

I would appreciate any help

Upvotes: 1

Views: 662

Answers (5)

Aleksey L.
Aleksey L.

Reputation: 37918

One of the possible solutions would be converting initial array to Map, updating it and converting it back to array:

const preData = [
    ['APP_NOT_RUNNING', 0],
    ['FALLBACK', 0],
    ['IDLE', 0],
    ['OUTOFSERVICE', 0]
];

const valueData = [
    ['APP_NOT_RUNNING', 2],
    ['IDLE', 3],
];

const map = new Map(preData);

for (const [key, value] of valueData) {
    map.set(key, value);
}

const result = Array.from(map);
console.log(result);

Update - typings could be:

const preData: ReadonlyArray<[string, number]> = [
    ['APP_NOT_RUNNING', 0],
    ['FALLBACK', 0],
    ['IDLE', 0],
    ['OUTOFSERVICE', 0]
];

const valueData: Array<[string, number]> = [
    ['APP_NOT_RUNNING', 2],
    ['IDLE', 3],
];

Upvotes: 1

Jagdish Idhate
Jagdish Idhate

Reputation: 7742

We can use .map & .find

preData = [
    ['APP_NOT_RUNNING', 0],
    ['FALLBACK', 0],
    ['IDLE', 0],
    ['OUTOFSERVICE', 0]
];

preData2 = [
    ['APP_NOT_RUNNING', 2],
    ['IDLE', 3],
];

const finalData = preData.map(x=>{
  const found = preData2.find(y=>y[0]===x[0])
  if(found)
    x[1] = found[1]
  return x;
})

console.log(finalData);

Upvotes: 0

Hussain Ali Akbar
Hussain Ali Akbar

Reputation: 1655

You will need to iterate over the preData array and check if a value exists for each value in the actualData array or not. If it doesnt, just push the default valye to the finalData array and if it does, add the value and then push it.

use forEach to iterate over the preData array and use filter to check if the data exists for each value in preData.

    const preData = [
      ['APP_NOT_RUNNING', 0],
      ['FALLBACK', 0],
      ['IDLE', 0],
      ['OUTOFSERVICE', 0]
    ];
    
    const actualData = [
      ['APP_NOT_RUNNING', 2],
      ['IDLE', 3],
    ];
    
    const finalData = [];
    
    preData.forEach(preDataValue => {
      const index = finalData.push(preDataValue);
      const data = actualData.filter(d => d[0] === preDataValue[0]);
      if (data.length) {
        finalData[index-1][1] += data[0][1];
      }
    });

    console.log(finalData);

Upvotes: 0

Mohammad Usman
Mohammad Usman

Reputation: 39322

You can use Map() and .forEach() method of arrays:

let arr1 = [
    ['APP_NOT_RUNNING', 0],
    ['FALLBACK', 0],
    ['IDLE', 0],
    ['OUTOFSERVICE', 0]
];

let arr2 = [
    ['APP_NOT_RUNNING', 2],
    ['IDLE', 3],
];

let updateArray = (a1, a2, map = new Map()) => {
  a1.forEach(arr => map.set(arr[0], arr));
  a2.forEach(arr => map.set(arr[0], arr));
  
  return [...map.values()];
};

console.log(updateArray(arr1, arr2));
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 2

Fullstack Guy
Fullstack Guy

Reputation: 16908

Match the the second array actualData content of index '0' with the original array preData index '0'. If it is a match, copy over that content from index '1' (the value) of actualData into the original array.

var preData = [
    ['APP_NOT_RUNNING', 0],
    ['FALLBACK', 0],
    ['IDLE', 0],
    ['OUTOFSERVICE', 0]
];
var actualData = [
    ['APP_NOT_RUNNING', 2],
    ['IDLE', 3],
];

preData.forEach((ele, idx, arr) =>{
        actualData.forEach(item =>{
                       if(item[0] === ele[0]){
                           ele[1] = item[1];
                           arr[idx] = ele;
                        }
                   });
});
console.log(preData);

Upvotes: 0

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