Tips for inserting a property into an array of objects when it matches the specified ID

Question

Tips for inserting a property into an array of objects when it matches the specified ID

As someone new to Angular, I am encountering an issue and would appreciate some help. Here is an array of objects I am working with:

signals = [{
'signalID': '123'
},{
'signalID': '233'
},{
'signalID': '333'
},{
'signalID': '433'
},{
'signalID': '533'
},{
'signalID': '633'
},{
'signalID': '733'
}]

Additionally, I have an object structured like this:

signalOrder = {
333:1,
433:2,
533:3
}

The goal is to add a 'orderNo' property to the signals array. If the 'signalID' matches a key in the signalOrder object, the 'orderNo' should be set accordingly, otherwise it should be null. The expected result is:

signals = [{
'signalID': '123',
'orderNo':null
},{
'signalID': '233',
'orderNo':null
},{
'signalID': '333',
'orderNo':1
},{
'signalID': '433',
'orderNo':2
},{
'signalID': '533',
'orderNo':3
},{
'signalID': '633',
'orderNo':null
},{
'signalID': '733',
'orderNo':null
}]

I believe this can be achieved using the JavaScript map function, though I am unsure of the exact implementation.

javascript angular typescript

Answer 1

Answer №1

To achieve this, you can follow the steps below:

let signals = [{'signalID': '123'},{'signalID': '233'},{'signalID': '333'},{'signalID': '433'},{'signalID': '533'},{'signalID': '633'},{'signalID': '733'}];

let signalOrder = {333:1,433:2,533:3}

let mapped = signals.map(x=>{
  return {
    signalID:x.signalID,
    orderNo:signalOrder[x.signalID]
  }
})

console.log(mapped)

Answer 2

To achieve this, you can follow the steps below:

let signals = [{'signalID': '123'},{'signalID': '233'},{'signalID': '333'},{'signalID': '433'},{'signalID': '533'},{'signalID': '633'},{'signalID': '733'}];

let signalOrder = {333:1,433:2,533:3}

let mapped = signals.map(x=>{
  return {
    signalID:x.signalID,
    orderNo:signalOrder[x.signalID]
  }
})

console.log(mapped)

Answer 3

Answer №2

To achieve the desired outcome, you can utilize the Array.map() method. It involves retrieving the orderNo from the signalOrder object for each signal item and setting it to null if it is not found.

const signals = [{ 'signalID': '123' },{ 'signalID': '233' },{ 'signalID': '333' },{ 'signalID': '433' },{ 'signalID': '533' },{ 'signalID': '633' },{ 'signalID': '733' }];

const signalOrder = {
  333:1,
  433:2,
  533:3
}

const result = signals.map(({signalID}) => ({ 
    signalID,
    orderNo: signalOrder[signalID] || null
}))

console.log('Result:', result)

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 4

To achieve the desired outcome, you can utilize the Array.map() method. It involves retrieving the orderNo from the signalOrder object for each signal item and setting it to null if it is not found.

const signals = [{ 'signalID': '123' },{ 'signalID': '233' },{ 'signalID': '333' },{ 'signalID': '433' },{ 'signalID': '533' },{ 'signalID': '633' },{ 'signalID': '733' }];

const signalOrder = {
  333:1,
  433:2,
  533:3
}

const result = signals.map(({signalID}) => ({ 
    signalID,
    orderNo: signalOrder[signalID] || null
}))

console.log('Result:', result)

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 5

Answer №3

This particular problem does not require Angular or Typescript. Instead, it can be resolved using standard JS Array methods.

One approach involves utilizing Array#map, the spread syntax, and checking for falsy values using the OR operator ||. When accessing signalOrder[signal.signalID], the result could be undefined for non-existing properties, which is considered falsy. In such instances, the value null would be utilized.

Give this method a try:

const signals = [{ 'signalID': '123' },{ 'signalID': '233' },{ 'signalID': '333' },{ 'signalID': '433' },{ 'signalID': '533' },{ 'signalID': '633' },{ 'signalID': '733' }]
const signalOrder = { 333:1, 433:2, 533:3 }

const result = signals.map(signal => ({
  ...signal,
  orderNo: signalOrder[signal.signalID] || null
}));

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 6

This particular problem does not require Angular or Typescript. Instead, it can be resolved using standard JS Array methods.

One approach involves utilizing Array#map, the spread syntax, and checking for falsy values using the OR operator ||. When accessing signalOrder[signal.signalID], the result could be undefined for non-existing properties, which is considered falsy. In such instances, the value null would be utilized.

Give this method a try:

const signals = [{ 'signalID': '123' },{ 'signalID': '233' },{ 'signalID': '333' },{ 'signalID': '433' },{ 'signalID': '533' },{ 'signalID': '633' },{ 'signalID': '733' }]
const signalOrder = { 333:1, 433:2, 533:3 }

const result = signals.map(signal => ({
  ...signal,
  orderNo: signalOrder[signal.signalID] || null
}));

console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 7

Answer №4

signals = [{
'signalID': '123'
},{
'signalID': '233'
},{
'signalID': '333'
},{
'signalID': '433'
},{
'signalID': '533'
},{
'signalID': '633'
},{
'signalID': '733'
}];

signalOrder = {
333:1,
433:2,
533:3
};

signals.map(obj => {
  if(obj.signalID in signalOrder){
    obj.orderNo = signalOrder[obj.signalID]
  }
  else{
    obj.orderNo = null
  }
})

console.log(signals)

Indeed, utilizing the JavaScript map function can solve this issue. You can test the code snippet below:

  signals.map(obj => {
  if(obj.signalID in signalOrder){
    obj.orderNo = signalOrder[obj.signalID]
  }
  else{
    obj.orderNo = null
  }
})

Answer 8

signals = [{
'signalID': '123'
},{
'signalID': '233'
},{
'signalID': '333'
},{
'signalID': '433'
},{
'signalID': '533'
},{
'signalID': '633'
},{
'signalID': '733'
}];

signalOrder = {
333:1,
433:2,
533:3
};

signals.map(obj => {
  if(obj.signalID in signalOrder){
    obj.orderNo = signalOrder[obj.signalID]
  }
  else{
    obj.orderNo = null
  }
})

console.log(signals)

Indeed, utilizing the JavaScript map function can solve this issue. You can test the code snippet below:

  signals.map(obj => {
  if(obj.signalID in signalOrder){
    obj.orderNo = signalOrder[obj.signalID]
  }
  else{
    obj.orderNo = null
  }
})

Tips for inserting a property into an array of objects when it matches the specified ID

Answer №1

Answer №2

Answer №3

Answer №4

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