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NexPips SDK

crossedUnder

crossedUnder

At a glance — true when series a crossed below b on the current bar: a was ≥ b one bar ago and a < b now. b can be another Series or a constant number. Requires a.length ≥ 2 (and b.length ≥ 2 when b is a series); returns false during warm-up instead of throwing.

Signature

function crossedUnder(a: Series, b: Series | number): boolean;

Example

indicators/ema-crossover
import { crossedOver, crossedUnder, defineStrategy, EMA } from '@nexpips/sdk-trading';


/**
 * Croisement de moyennes exponentielles. Golden cross (EMA rapide passe
 * au-dessus de la lente) → entrée ; death cross → sortie. Montre `EMA`,
 * `crossedOver` et `crossedUnder`.
 */
export default defineStrategy({
  symbol: 'EURUSD',
  timeframe: 'H1',
  risk: { maxRiskPercentPerTrade: 1, maxOpenPositions: 1, maxDailyLossPercent: 5 },
  setup: (api) => {
    const fast = api.use(EMA, { source: 'close', period: 12 });
    const slow = api.use(EMA, { source: 'close', period: 26 });


    return {
      onBar(ctx) {
        if (ctx.position.isFlat && !ctx.position.hasPendingOrder && crossedOver(fast, slow)) {
          ctx.order.marketBuy({
            riskPercent: 1,
            stopLoss: { type: 'atr', period: 14, multiple: 2 },
            takeProfit: { type: 'rr', value: 2 },
          });
          return;
        }


        if (ctx.position.isLong && crossedUnder(fast, slow)) {
          ctx.order.closePosition('ema death cross');
        }
      },
    };
  },
});

Death cross closes the position.

See also