有没有办法在 JavaScript 中命名箭头函数？

Question

I'm using arrow functions in an app and sometimes there is the need to get a reference to the function itself. For normal JavaScript functions, I can just name them and use the name from within. For arrow functions, I'm currently using arguments.callee . Is there a way to name arrow functions so that a reference can be used from within?

Sample code

// TypeScript
private evaluateIf(expr: parserModule.IIfExpression, callback: IEnvCallback) {
    this.evaluate(expr.condition, proceed => {
        guard(arguments.callee, arguments, this);
        if (proceed !== false) this.evaluate(expr.then, callback);
        else if (expr.else) this.evaluate(expr.else, callback);
        else callback(false);
    });
}

// JavaScript
Environment.prototype.evaluateIf = function (expr, callback) {
    var _this = this;
    this.evaluate(expr.condition, function (proceed) {
        guard(arguments.callee, arguments, _this);
        if (proceed !== false)
            _this.evaluate(expr.then, callback);
        else if (expr.else)
            _this.evaluate(expr.else, callback);
        else
            callback(false);
    });
};

What I settled on after the assistance since arguments might not be there forever:

private evaluateIf(expr: parserModule.IIfExpression, callback: IEnvCallback) {
    var fn;
    this.evaluate(expr.condition, fn = proceed => {
        guard(fn, [proceed], this);
        if (proceed !== false) this.evaluate(expr.then, callback);
        else if (expr.else) this.evaluate(expr.else, callback);
        else callback(false);
    });
}

Answer 1

Is there a way to name arrow functions so that a reference can be used from within?

Not unless you assign it to a variable. For example:

var foo = () => {
    console.log(foo);
}

For arrow functions, I'm currently using arguments.callee

arguments are not supported by arrow functions. TypeScript currently incorrectly allows you to use them. This will be an error in the next version of TypeScript. This is to keep TypeScript arrow functions compatible with the JavaScript Language Specification .

For your use case I would just use a function .