JS Design Patterns: State, see more at: https://medium.com/p/4a8e1f30b62d

DESIGN_PATTERNS_TVRemoteWithouStatePattern.js

/* WITHOUT STATE PATTERN EXAMPLE */

class TVRemoteWithoutStatePattern {
  constructor() {
    this.channel = 1;
  }

  setChannel(channel) {
    this.channel = channel;
  }

  watch() {
    if (this.channel === 1) {
      console.log("Hello, watch sports on channel 1");
    }

    if (this.channel === 2) {
      console.log("Hello, watch a serie on channel 2");
    }

    if (this.channel === 3) {
      console.log("Hello, watch the daily news on channel 3");
    }
  }
}

const TVRemoteInstance0 = new TVRemoteWithoutStatePattern();

TVRemoteInstance0.setChannel(1);
TVRemoteInstance0.watch();

TVRemoteInstance0.setChannel(2);
TVRemoteInstance0.watch();

TVRemoteInstance0.setChannel(3);
TVRemoteInstance0.watch();