CODEWITHSUNDEEP
arraysangulartypescriptionic-framework
William Manzato
William Manzato

Reputation: 199

Get element from JSON and slice it

I've got this JSON array (mdataarray)

[
{
"frumain" : "ESC",
"fruother" : "PAC or SEP or SPCB",
"connector" : "SE3 or SE7",
"sensor" : "ECHC, ECPC, ECCC, PCEC",
"motorsolenoid" : "ESCM",
"causeoferror" : "004, 101, 102, 103, 104, 106, 107, 108, 110, 111, 210, 211, 212, 213, 301, 302, 303, 304, 305, 306, 307, 312"
}
]

And I need to get just "causeoferror" object and slice it where the commas but I don't get it. I defined a new variable

public mdatacoe : string;

But when I do 

this.mdatacoe = this.mdataarray.causeoferror;

In the console log I recieve undefined.

I'm pretty new to Typescript, I don't understand what I fail.

Upvotes: 2

Views: 149

Answers (3)

student dev
student dev

Reputation: 132

Considering your variable mdatacoe is of type string and not of type string[]:

I added a duplicate of the same json object into the array to mock multiple "causeoferror" properties. The map operator accesses the "causeoferror" property and the join operator converts the array to a string.

const foo = [
  {
    frumain: "ESC",
    fruother: "PAC or SEP or SPCB",
    connector: "SE3 or SE7",
    sensor: "ECHC, ECPC, ECCC, PCEC",
    motorsolenoid: "ESCM",
    causeoferror:
      "004, 101, 102, 103, 104, 106, 107, 108, 110, 111, 210, 211, 212, 213, 301, 302, 303, 304, 305, 306, 307, 312"
  },
  {
    frumain: "ESC",
    fruother: "PAC or SEP or SPCB",
    connector: "SE3 or SE7",
    sensor: "ECHC, ECPC, ECCC, PCEC",
    motorsolenoid: "ESCM",
    causeoferror:
      "004, 101, 102, 103, 104, 106, 107, 108, 110, 111, 210, 211, 212, 213, 301, 302, 303, 304, 305, 306, 307, 312"
  }
];

const bar = foo.map(x => x.causeoferror).join();

console.log(bar);

If you are indeed wanting an array of type string[], then @StepUp solution should be considered instead.

Upvotes: 0

StepUp
StepUp

Reputation: 38209

Just take necessary object property of an array. Then you can split your string by comma sign ',':

const result = arr.map(({causeoferror}) => causeoferror.split(','));

An example:

let arr = [
    {
        "frumain": "ESC",
        "fruother": "PAC or SEP or SPCB",
        "connector": "SE3 or SE7",
        "sensor": "ECHC, ECPC, ECCC, PCEC",
        "motorsolenoid": "ESCM",
        "causeoferror": "004, 101, 102, 103, 104, 106, 107, 108, 110, 111, 210, 211, 212, 213, 301, 302, 303, 304, 305, 306, 307, 312"
    }
];

const result = arr.map(({causeoferror}) => causeoferror.split(','));
console.log(...result);

Upvotes: 1

Mu'men Tayyem
Mu'men Tayyem

Reputation: 91

It's an array. change your code to this: this.mdatacoe = this.mdataarray[0].causeoferror;

Upvotes: 0

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