How to remove first 5 characters from this string?-CodePudding

I have a string like this (HTML select list):

const config = {
    "celsius": {
        "celsius": v => v,
        "fahrenheit": v => v * 1.8   32,
        "kelvin": v => v   273.15,
        "rankine": v => (v   273.15) * 1.8,
        "reaumur": v => v * 0.8,
    },
    // more...
}

And I want to cut the first 5 characters from the output (operationPlace)

var listOperation = config[listFromV][listToV].substring(5);
document.getElementById("operationPlace").innerHTML = listOperation;
// now it looks like this: v => v or v => v * 1.8   32 etc.
// should look like this: v or v * 1.8   32 etc. (I'd like to change that "v" to numbers from the input (inputPlace) too)

I tried using substring, but it didn't work. Is there a way to do this?

CodePudding user response：

You can obtain the definition of a function in the form of a string by calling .toString on it, then call .substring to get rid of the function signature part:

var listOperation = config[listFromV][listToV];
document.getElementById("operationPlace").innerHTML = listOperation.toString().substring(5);

CodePudding user response：

Convert this string to an array and then pull out your desired values.