Can I replace high() with a variable?

[tasman]

Is there a short, easy way that I can replace a function call like close() with a variable name like vOHLC() (as in example 1) or am I just going to have to use a longer test for the parameter setting (as in example 2)?

Dale Sullivan

//  ***  EXAMPLE 1  ***

    var fp1 = new FunctionParameter("vOHLC", FunctionParameter.STRING);
    fp1.setName("vOHLC");
    fp1.addOption("open");
    fp1.addOption("high");
    fp1.addOption("low");
    fp1.addOption("close");
    fp1.setDefault("close");

}
function main(vOHLC) {

    vPrice1 = close(vSymbol);
    vPrice2 = vOHLC(vSymbol) + 4;

    return new Array(vPrice1, vPrice2);

} 

//  ***  EXAMPLE 2  ***

    var fp1 = new FunctionParameter("vOHLC", FunctionParameter.STRING);
    fp1.setName("vOHLC");
    fp1.addOption("open");
    fp1.addOption("high");
    fp1.addOption("low");
    fp1.addOption("close");
    fp1.setDefault("close");

}
function main(vOHLC) {


    vPrice1 = close(vSymbol);

switch (vOHLC) {
     case "open" :
          vPrice2 = open(vSymbol) + 4;
          break;
     case "high" :
          vPrice2 = high(vSymbol) + 4;
          break;
     case "low" :
          vPrice2 = low(vSymbol) + 4;
          break;
     case "close" :
          vPrice2 = close(vSymbol) + 4;
          break;
     default :
          vPrice2 = close(vSymbol) + 4;
}

    return new Array(vPrice1, vPrice2); 

[eSignal_JasonK]

Hello Dale,

You can accomplish this with the use of eval(). It basically evaluates a string and turns it into a constant or literal. Not sure if that is the best way to describe it. The code example below should make its usage a little more clear. All you need to do is create one big string that would evaluate to the line of code you need and simply pass it to the eval() function. Another alternative is to use getValue() instead. There is an example of this in the code as well. This will allow you to avoid using the eval() function since vOHLC is already a string. Let me know if this helps.

//  ***  EXAMPLE 1  ***

function preMain() {
    setPriceStudy(true);
    setStudyTitle(" eval() example ");
    setCursorLabelName("Price 1",0);
    setCursorLabelName("Price 2",1);
    
    var fp1 = new FunctionParameter("vOHLC", FunctionParameter.STRING);
    fp1.setName("vOHLC");
    fp1.addOption("open");
    fp1.addOption("high");
    fp1.addOption("low");
    fp1.addOption("close");
    fp1.setDefault("close");
}

function main(vOHLC) {
    var vSymbol = getSymbol();
    var str = vOHLC + "('" + vSymbol + "')"
    
    vPrice1 = close(0, 1, vSymbol)*1;
    vPrice2 = eval(str) + 4;

    //Another alternative is to use getValue(), try:
    //vPrice2 = getValue(vOHLC, 0, 1, vSymbol)*1 + 4;

    return new Array(vPrice1, vPrice2);

} 

[tasman]

Thanks a lot Jason. That's exactly what I was looking for.

Dale