resultArr0 = ARR_0 * 2 // would like to multiply each item in ARR_0 by 2, and saves in resultArr0. 

resultArr0 = ARR_0.map(item => item * 2) 

resultArr1 = ARR_1 - ARR_2 // which means items in ARR_1 minus items in ARR_2 one by one, and returns a new array with the result. 

import FinUtil from './util/FinUtil' resultArr0 = FinUtil.arrOp(ARR_0, 2, '*') // case1, ARR_0 * 2 resultArr1 = FinUtil.arrOp(ARR_1, ARR_2, '-') // case2, ARR_1 - ARR_2 

MA(CLOSE, 123) 

//assume your data arranged as following: const _DATAS_ = [{ "open": 140.12, "high": 141.03, "low": 139.5, "cLoSe": 139.68, "volume": 25446000, "date": "2019-08-11" }, { "open": 139.69, "high": 140.29, "low": 139.52, "cLoSe": 139.55, "volume": 13304300, "date": "2019-08-12" }] 

import FinUtil from '@/lib/util/FinUtil' import MA from '@/lib/MA' 

const closePriceArr = FinUtil.genArrByProp(_DATAS_, 'cLoSe') const ma = MA(closePriceArr, 123) // calculate the ma based on CLOSE and the parameter 123 

DIF = EMA(CLOSE, SHORT) - EMA(CLOSE, LONG) DEA = EMA(DIF, MID) MACD = (DIF - DEA) * 2 

import FinUtil from '@/lib/util/FinUtil' import EMA from '@/lib/EMA' const close = FinUtil.genArrByProp(_DATAS_, 'cLoSe') const dif = FinUtil.arrOp(EMA(close, 12), EMA(close, 26), '-') // DIF = EMA(CLOSE, 12) - EMA(CLOSE, 26) const dea = EMA(dif, 9) // DEA = EMA(DIF, 9) const macd = FinUtil.arrOp(FinUtil.arrOp(dif, dea, '-'), 2, '*') // MACD = (DIF - DEA) * 2 

TR1 = MAX(MAX((HIGH - LOW), ABS(REF(CLOSE, 1) - HIGH)), ABS(REF(CLOSE, 1) - LOW)) ATR1 = MA(TR1, M) 

BBIBOLL = (MA(CLOSE, 3) + MA(CLOSE, 6) + MA(CLOSE, 12) + MA(CLOSE, 24)) / 4 UPR = BBIBOLL + M * STD(BBIBOLL, N) DWN = BBIBOLL - M * STD(BBIBOLL, N) 

MA_V0 = MA(CLOSE, V0) MA_V1 = MA(CLOSE, V1) MA_V2 = MA(CLOSE, V2) BIAS1 = (CLOSE - MA_V0) / MA_V0 * 100 BIAS2 = (CLOSE - MA_V1) / MA_V1 * 100 BIAS3 = (CLOSE - MA_V2) / MA_V2 * 100 

MID = MA(CLOSE, PERIOD) UPPER= MID + TIMES * STD(CLOSE, PERIOD) LOWER= MID - TIMES * STD(CLOSE, PERIOD) 

TYP = (HIGH + LOW + CLOSE) / 3 CCI = (TYP - MA(TYP, N)) / (0.015 * AVEDEV(TYP, N)) 

CH = REF(HIGH, 1) CL = REF(LOW, 1) CC = REF(CLOSE, 1) CDP = (CH + CL + CC) / 3 AH = CDP + CH - CL AL = CDP - CH + CL NH = CDP * 2 - CL NL = CDP * 2 - CH 

DIF = MA(CLOSE, SHORT) - MA(CLOSE, LONG) DMA = MA(DIF, M) 

MTR = EXPMEMA(MAX(MAX(HIGH - LOW, ABS(HIGH - REF(CLOSE, 1))), ABS(REF(CLOSE, 1) - LOW)), N) HD = HIGH - REF(HIGH, 1) LD = REF(LOW, 1) - LOW DMP = EXPMEMA(IF(HD > 0 && HD > LD, HD, 0), N) DMM = EXPMEMA(IF(LD > 0 && LD > HD, LD, 0), N) PDI = DMP * 100 / MTR MDI = DMM * 100 / MTR ADX = EXPMEMA(ABS(MDI - PDI) / (MDI + PDI) * 100, M) ADXR = EXPMEMA(ADX, M) 

VOLUME = MA(VOL, N) / VOL MID = 100 * (HIGH + LOW - REFV(HIGH + LOW, 1)) / (HIGH + LOW) EMV = MA(MID * VOLUME * (HIGH - LOW) / MA(HIGH - LOW, N), N) EMVA = MA(EMV, N1) 

UPPER = (1 + M1 / 100) * MA(CLOSE, M) LOWER = (1 - M2 / 100) * MA(CLOSE, M) ENE = (UPPER + LOWER) / 2 

RSV = (CLOSE - LLV(LOW, P1)) / (HHV(HIGH, P1) - LLV(LOW, P1)) * 100 K = SMA(RSV, P2, 1) D = SMA(K, P3, 1) J = 3 * K - 2 * D 

DIF = EMA(CLOSE, SHORT) - EMA(CLOSE, LONG) DEA = EMA(DIF, MID) MACD = (DIF - DEA) * 2 

AA = C - REF(C, M) MI = SMA(AA, M, 1) 

MTM = CLOSE - REF(CLOSE, N) MTMMA = MA(MTM, M) 

OSC = 100 * (CLOSE - MA(CLOSE, N)) OSCEMA = EXPMEMA(OSC, M) 

ROC = (CLOSE - REF(CLOSE, N)) / REF(CLOSE, N) * 100 ROCMA = MA(ROC, M) 

LC = REF(CLOSE, 1) MAXARR = MAX(CLOSE - LC, 0) ABSARR = ABS(CLOSE - LC) RSI1 = SMA(MAXARR, v0, 1) / SMA(ABSARR, v0, 1) * 100 RSI2 = SMA(MAXARR, v1, 1) / SMA(ABSARR, v1, 1) * 100 RSI3 = SMA(MAXARR, v2, 1) / SMA(ABSARR, v2, 1) * 100 

TR = EMA(EMA(EMA(CLOSE, P), P), P) TR1 = REF(TR, 1) TRIX = (TR - TR1) / TR1 * 100 TRMA = MA(TRIX, N) 

ref1 = REF(CLOSE, 1) TH = SUM(IFF(CLOSE > LC, VOL, 0), N) TL = SUM(IFF(CLOSE < LC, VOL, 0), N) TQ = SUM(IFF(CLOSE = LC, VOL, 0), N) VR = 100 * (TH * 2 + TQ) / (TL * 2 + TQ) VRMA = MA(VR, M) 

WVAD = (CLOSE - OPEN) / (HIGH - LOW) * VOL