error handling

const CustomError = (message) => {
	//객체로 오류 상태를 던지도록 한다
	this.message = message
	this.type = 'NotImageFileException'
}

try {
	const imgTypes = ['.jpg','.png']
	const fileName = 'node.doc'
	const isImageFile = imgTypes.find(ext => fileName.endWith(item))
	if(!isImageFile){
		throw new CustomError('this is not a image file')
		//throw new 'this is not a image file'
	}
}catch(e){
	console.log(e)
}