What is the author's style in Before I Fall by Lauren Oliver?

This novel is written for teenaged, young adult readers, and stars characters of the same age range. Because of this, the language is very conversational, with the voice of each character ringing true to what readers would hear everyday in their high school hallways - or what they remember of their high school hallways. Lauren Oliver has clearly researched the voice of her characters deeply, which makes all the language, including the inner thoughts and dialogue completely believable. Oliver does not shy away from the over-sexualization and profanity in teenage language, and it is justly evident in the text.