function trycatchAsync( x, y, done ) {
	if ( !isFunction( x ) ) {
		throw new TypeError( format( 'invalid argument. First argument must be a function. Value: `%s`.', x ) );
	}
	if ( !isFunction( done ) ) {
		throw new TypeError( format( 'invalid argument. Last argument must be a function. Value: `%s`.', done ) );
	}
	x( clbk );

	/**
	* Callback invoked by `x`.
	*
	* @private
	* @param {(Error|null)} error - error object
	* @param {*} result - result
	* @returns {void}
	*/
	function clbk( error, result ) {
		if ( error ) {
			return done( error, y );
		}
		done( null, result );
	}
}
If a function does not return an error, invokes a callback with the function result; otherwise, invokes a callback with a value `y`.

@param {Function} x - function to invoke
@param {*} y - value to return if `x` returns an error
@param {Function} done - callback to invoke upon completion
@throws {TypeError} first argument must be a function
@throws {TypeError} last argument must be a function

@example
var randu = require( '@stdlib/random/base/randu' );

function x( clbk ) {
    setTimeout( onTimeout, 0 );
    function onTimeout() {
        if ( randu() > 0.5 ) {
            return clbk( null, 1.0 );
        }
        clbk( new Error( 'beep' ) );
    }
}

function done( error, result ) {
    if ( error ) {
        console.log( error.message );
    }
    console.log( result );
}

trycatchAsync( x, -1.0, done );