Loading instance variables form a file in Typescript -

here's code:

import fs = require('fs');  export interface answer {   order: number,   text: string }  export class config {   responses:answer[];   timestamp_column: string;   name_column: string    fromjsonfile(filename: string) {     var filestring = fs.readfilesync(filename);     var parsedfile = json.parse(filestring.tostring());     this.responses = parsedfile.responses;     this.timestamp_column = parsedfile.timestamp_column;     this.name_column = parsedfile.name_column;   }    mapanswertonum(answer:string):number {     (var of this.responses) {       if (a.text == answer) { return a.order;}     }     throw new error(`invalid response string ${answer}`);   } } 

it reads in file:

{   "responses": [     { "value": 0, "text": "at loss explain it..."},     { "value": 1, "text": "have vague sense..."},     { "value": 2, "text": "pretty handle on it..."},     { "value": 3, "text": "confident understand it..."},     { "value": 4, "text": "feel pretty expert @ it..."}   ],   "timestamp_column": "timestamp",   "name_column": "first name" } 

notice copying each instance variable it's corresponding json field, 1 one, in fromjsonfile. seems repetitive given take care make sure class structured precisely json file. there better way? thanks!

use object.assign

fromjsonfile(filename: string) {     var filestring = fs.readfilesync(filename);     var parsedfile = json.parse(filestring.tostring());     object.assign(this,parsedfile); }