ReactJS by Example - Building Modern Web Applications with React by 2016

Author:2016
Language: eng
Format: mobi, epub
Publisher: Packt Publishing

"Shawn, this is functional; however, it's not following the React way. React assumes that the state object is immutable. Here we are using reference to the books from the existing state when we are assigning value to unsortedBooks."

let unsortedBooks = this.state.books;

"Later, we are mutating unsortedBooks into sortedBooks; however, as a side-effect, we are also mutating the current value of this.state."

_sortByTitle() { let sortByAttribute = this.state.sorting === 'asc' ? "title" : "-title"; let unsortedBooks = this.state.books; console.log("Before sorting :"); console.log(this.state.books[0].title); let sortedBooks = unsortedBooks.sort(sortBy(sortByAttribute)); console.log("After sorting :"); console.log(this.state.books[0].title); // this.setState({ books: sortedBooks, sorting: this._toggleSorting() }); },

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