Typescript json references variable but need check if variable exists

Question

I have some json code within a function that looks like this:

getFields(name: string) {
   this.json_data = [
      {
        "e_name": "fake_c",
        "fields": [
          {
            "f_name": "c_name",
            "title": "K C Name",
            "c_name": "cname",
            "path": this.dialogData.name
          },
          {
            "f_name": "c_number",
            "title": "K C Number",
            "c_name": "cnumber",
            "path": this.dialogData.c_id
          }
        ]
      },
      {
        "e_name": "other_c",
        "fields": [
          {
            "f_name": "c_name",
            "title": "K C Name",
            "c_name": "cname",
            "path": this.dialogData.r_name
          },
          {
            "f_name": "c_address",
            "title": "K C Address",
            "c_name": "caddress",
            "path": this.dialogData.r_address
          },
          {
            "f_name": "c_number",
            "title": "K C Number",
            "c_name": "cnumber",
            "path": this.dialogData.r_number
          }
        ]
      }
    ];
   return this.known_company_mapping.filter((d)=> d.entity_name === name).map((res) => res.fields)[0]

As you can see, based on the e_name, I am filtering the json.

However, my code is breaking due to the path that refers to dialogData.

When e_name is equal to 'fake_c', then the dialogData follows the structure that is used in the 'fake_c' paths, eg it contains a name and c_id component.

However, when 'fake_c' is used, then the paths for other_c breaks as the dialogData doesn't have r_name for example. When 'fake_c' is being used, I'm not interested in the paths for 'other_c'.

Is there any way I can make the path equal to null if the variable doesn't exist?

I've tried the below with no success:

"path": if(this.dialogData.r_name) {this.dialogData.r_name} else {''}

And also the below:

"path": this.dialogData.r_name ? this.dialogData.r_name : ''

Or Yaacov · Accepted Answer · 2020-08-26 16:24:52Z

1

the following quick if must work:

(this.dialogData.r_name ? this.dialogData.r_name : "")

as you can see in the example below.

make sure that your program re-built after each try, and that the quick if is actually running using

debugger;

or breakpoints.

this.dialogData={};
this.dialogData.r_name="test";
console.log({"path": (this.dialogData.r_name ? this.dialogData.r_name : "")});
this.dialogData.r_name=undefined;
console.log({"path": (this.dialogData.r_name ? this.dialogData.r_name : "")});

answered Aug 26, 2020 at 16:24

Or Yaacov

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