May 6, 2020 (Wed)

macOS에서 Emacs 27 버전 설치

brew tap d12frosted/emacs-plus
# 컴파일할 때 imagemagic 옵션을 주지 말것!
brew install emacs-plus --with-emacs-27-branch --with-gnutls --with-librsvg --with-cocoa --HEAD

class BinaryTree {
    constructor(value, left=null, right=null) {
        this.value = value;
        this.left = left;
        this.right = right;
    }

    /** Prefix iteration */
    * [Symbol.iterator]() {
        yield this.value;
        if (this.left) {
            yield* this.left;
            // Short for: yield* this.left[Symbol.iterator]()
        }
        if (this.right) {
            yield* this.right;
        }
    }
}
const tree = new BinaryTree('a',
    new BinaryTree('b',
        new BinaryTree('c'),
        new BinaryTree('d')),
    new BinaryTree('e'));
for (const x of tree) {
    console.log(x);
}
// Output:
// a
// b
// c
// d
// e