CODEWITHSUNDEEP
javascriptregex
node_man
node_man

Reputation: 1449

check if a string matches with a given string from a certain position onwards javascript

var obj2 = [{
  "name": "4134",
  "calls": [

  ]
}]

    var obj3 = [{ Channel: 'SIP/4134-0004462a',
        State: 'Up',
        Accountcode: '7013658596'},
      { Channel: 'SIP/4334-sa',
        State: 'Up',
        Accountcode: '07717754702',
      }]


var channelArr = [];
const Channels = obj3.reduce((acc, curVal) => {
  obj2.forEach((item)=>{
    if(curVal.Channel.includes('SIP') &&  item.name == curVal.Channel.slice(4,8).toString()){
      item.calls.push({'MobileNo':curVal.Accountcode,'Status': curVal.State})
    }
  })
  return obj2;
}, [])

console.log(obj2);

The output of the above code is 

[
  {
    "name": "4134",
    "calls": [
      {
        "MobileNo": "7013658596",
        "Status": "Up"
      }
    ]
  }
]

My code takes "name": "4134" from obj2 and Channel: 'SIP/4134-0004462a from obj3. It then checks if 4134 from obj2 exists in the value 'SIP/4134-0004462a' from obj3 using the code curVal.Channel.includes('SIP') && item.name == curVal.Channel.slice(4,8).toString() . If the value exists then it pushes the MobileNo and AccountCode from that particular object and pushes it into the calls array of obj2. Since Channel: 'SIP/4134-0004462a is very predictable here as if the value contains SIP and slice(4,8) position then 4134 matches perfectly. But what if instead of 4134 I have to match a value like "name" : "4134556" ? In this case it won't work as 4134556 won't match with 'SIP/4134556-0004462a if I use slice(4,8) on obj3. I want a solution such that it takes the value of name key from obj2 and takes the value of Channel key from obj3 and check if the value from obj2 exists in Channel value starting from position 4 (i.e after SIP/ ) I don't want to set a limit like splice(4,8), instead it should be something dynamic which can match any digit of name with the Channel starting from position 4 in the Channel value (expecting something like splice(start from 4th position and match the next digits for a match) ). This will let me match the numbers perfectly even if they have any number of digits.

What I tried as a temporary solution :

if(curVal.Channel.includes('SIP') && curVal.Channel.includes(item.name))

but this gives me wrong result at Channel : SIP/3422-0413462a from obj3 will also match with name : 4134 from obj2 as it contains the number 4134 at some other position and this is not the desired result.

How do I do it such that name from obj2 is matched with Channel of obj3 starting from the 4th position i.e after SIP/ and check if there's a match?

Upvotes: 0

Views: 53

Answers (3)

Robby Cornelissen
Robby Cornelissen

Reputation: 97130

You can use String.prototype.startsWith(searchString, position):

console.log('SIP/4134556-0004462a'.startsWith('4134556', 4)); // true

The position parameter allows to specify where in the haystack you want to search for the needle (in your case position 4).

This might give you another issue, as this will also evaluate to true:

'SIP/4134556-0004462a'.startsWith('4134', 4); // true

If this is not what you want (i.e. you want the value to be followed by the - separator), you have to add the separator to your search string:

'SIP/4134556-0004462a'.startsWith('4134' + '-', 4) // false

Upvotes: 3

Prasad Telkikar
Prasad Telkikar

Reputation: 16049

Get Sub string of Channel from position 4 to end and check name is exist in that substring or not

var channel = "SIP/4134123-0004462a"; //your channel name
console.log(channel.substring(4).includes("4134123")); //your name

Upvotes: 1

Code Maniac
Code Maniac

Reputation: 37755

You can use name length as the second parameter to slice. you don't need regex here mate :)

Something like this

curVal.Channel.slice(4,4+item.name.length)
                       ^^^^^^^^^^^^^^^^^^


var obj2 = [{
  "name": "4134123",
  "calls": [

  ]
}]

    var obj3 = [{ Channel: 'SIP/4134123-0004462a',
        State: 'Up',
        Accountcode: '7013658596'},
      { Channel: 'SIP/4334-sa',
        State: 'Up',
        Accountcode: '07717754702',
      }]


var channelArr = [];
const Channels = obj3.reduce((acc, curVal) => {
  obj2.forEach((item)=>{
    if(curVal.Channel.includes('SIP') &&  item.name == curVal.Channel.slice(4,4+item.name.length).toString()){
      item.calls.push({'MobileNo':curVal.Accountcode,'Status': curVal.State})
    }
  })
  return obj2;
}, [])

console.log(obj2);

Upvotes: 1

Related Questions