Question 184394 in Javascript Question posted in
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Javascript – declared Variable turned "Undefined" dont know how?

I have this Config.ts file that contains some basic numbers
when initializing app it can read values from variables but later I cant read this variables because of "TypeError: Cannot read properties of undefined (reading ‘initLevrage’)
at getTimeName (config.ts:38:22)"
please Help

import { log } from 'console';
import { ITimeFrameTypes } from '../tbBot/bot.interface';

export class Configs {
  private initMargin = 1;
  private initLevrage = [
    100, 90, 80, 70, 60, 50, 40, 30, 20, 15, 13, 11, 10, 8, 6, 5, 4, 3,
  ];
  private timeFrames: ITimeFrameTypes[] = [
    '1m',
    '5m',
    '15m',
    '1h',
    '4h',
    '1d',
    '1M',
  ];
  checkFrameType(name: ITimeFrameTypes) {
    let t: string = name;
    if (name == '1M') {
      t = '1mo';
    }
    return t;
  }
  getMarginInit() {
    return this.initMargin;
  }
  setMarginInit(n: number) {
    this.initMargin = n;
  }
  getLevrages() {
    return this.initLevrage.map(x=>x);
  }
  getTimes() {
    return this.timeFrames.map(x=>x);
  }
  getTimeName(i: number) {
    log( typeof this.initLevrage);
    let t = this.timeFrames[i];
    return this.checkFrameType(t);
  }
  getTimeIndex(name: ITimeFrameTypes) {
    let t = this.timeFrames.indexOf(name);
    return t;
  }
}

it Logs iniLevrage Values fist but cant find it later

I have tried to move these vaiables out of class scope , then assign them to variables but no diffrence

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2

Answers


  1. Chosen as BEST ANSWER
    0

    I found the problem I was calling the function like this: let frame = this.config.getTimeName; then calling frame : frame(i) deleting frame and using this.config.getTimeName(i) , the problem was Gone.

    thanks


  2. 0

    I think the issue is likely with how you’re invoking your methods – check out this TS playground I set up

    I think for a quick fix, you can change your methods from

      getTimeName(i: number) {
    log( typeof this.initLevrage);
    let t = this.timeFrames[i];
    return this.checkFrameType(t);
  }

    to

      getTimeName = (i: number) => {
    log( typeof this.initLevrage);
    let t = this.timeFrames[i];
    return this.checkFrameType(t);
  }

    The latter anonymous function will let you access this from any context you’d like

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