In javascript, every object has a bunch of built-in key-value pairs that have meta-information. When you loop through all the key-value ... ... <看更多>

有時要將JS 物件轉成其他資料結構，所以需要迭代物件中的所有property，過去會用for-in 陳述句，但只想列舉own property，就必須用hasOwnProperty() ... ... <看更多>

Simple javascript key/value cache. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

Prior to ES6, when you need to map keys to values, you often use an object, because an object allows you to map a key to a value of any type. However, using an ... ... <看更多>

... <看更多>