Get element from JSON and slice it

Question

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.

The array doesn't have that property, the object in it does. I'd strongly recommend reading up on basic JS. — jonrsharpe
– jonrsharpe, Commented Dec 27, 2019 at 19:55
What do you mean "which property"? The one you asked for, causeoferror. You should know it's an array, as you included that in the name. — jonrsharpe
– jonrsharpe, Commented Dec 27, 2019 at 20:07
@WilliamManzato You should be looking at this.mdataarray[0].causeoferror since the object is contained within an array. — dx_over_dt
– dx_over_dt, Commented Dec 28, 2019 at 0:33

StepUp · Accepted Answer · 2019-12-27 20:06:48Z

1

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);

answered Dec 27, 2019 at 20:06

StepUp

38.5k16 gold badges95 silver badges159 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

student dev · Accepted Answer · 2019-12-28 03:23:22Z

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.

Mu'men Tayyem · Accepted Answer · 2019-12-27 19:59:00Z

0

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

answered Dec 27, 2019 at 19:59

Mu'men Tayyem

915 bronze badges

Collectives™ on Stack Overflow

Get element from JSON and slice it

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related