parallel-es/src/common/util/function-name.ts

Simple parallelization for EcmaScript

/**
 * Returns the name of a function.
 * Function.name contains the name of the function. However, Internet Explorer does not implement this property.
 * Therefore, uses Function.name if defined and otherwise extract the name from source
 * @param func the function for which the name is desired
 * @returns the name of the function or an empty string for an anonymous function
 */
export function getFunctionName(func: Function): string {
    if (func.hasOwnProperty("name")) {
        return func.name;
    }

    const source = func.toString();
    const functionKeywordStart = source.indexOf("function");

    // Arrow Function Expressions
    if (functionKeywordStart === -1) {
        return "";
    }

    return source.substring(functionKeywordStart + 8, source.indexOf("(")).trim();
}