Created
          November 20, 2022 18:48 
        
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    frame first byte
  
        
  
    
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  | parseFrame(buffer) { | |
| const firstByte = buffer.readUInt8(0); | |
| const opCode = firstByte & 0b00001111; // get last 4 bits of a byte | |
| if (opCode === this.OPCODES.close) { | |
| this.emit('close'); | |
| return null; | |
| } else if (opCode !== this.OPCODES.text) { | |
| return; | |
| } | |
| // second byte processing next... | |
| } | 
  
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