Arcade Trader strategy to invest when the sma50 line crosses over the sma200 line and sell when the sma50 crosses below sma200 line

wma150-crossover-wma200.js

function beginTrading(context){
  if( History.days().length > 1 ) {
    let yesterday = History.last();
    let prev = History.relative(-1);
  
    if( yesterday.wma150 >= yesterday.wma200  &&
        prev.wma150 < prev.wma200 )
      return { invest: true, reason: "wma-150 crossed over wma-200" };
  }
}

function endTrading(context){
  let yesterday = History.last();
  let prev = History.relative(-1);

  if( yesterday.wma150 < yesterday.wma200  &&
      prev.wma150 >= prev.wma200 )
    return { reason: "wma-150 crossed below wma-200" }
}