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                * 立即執行函數可以寫成箭頭函數的形式。 ``` (() => { console.log('Welcome to the Internet.'); })(); ``` * 那些需要使用函數表達式的場合,盡量用箭頭函數代替。因為這樣更簡潔,而且綁定了 this。 ``` // bad [1, 2, 3].map(function (x) { return x * x; }); // good [1, 2, 3].map((x) => { return x * x; }); // best [1, 2, 3].map(x => x * x); ``` * 箭頭函數取代Function.prototype.bind,不應再用 self/_this/that 綁定 this。 ``` // bad const self = this; const boundMethod = function(...params) { return method.apply(self, params); } // acceptable const boundMethod = method.bind(this); // best const boundMethod = (...params) => method.apply(this, params); ``` * 簡單的、單行的、不會復用的函數,建議采用箭頭函數。如果函數體較為復雜,行數較多,還是應該采用傳統的函數寫法。 * 所有配置項都應該集中在一個對象,放在最后一個參數,布爾值不可以直接作為參數。 ``` // bad function divide(a, b, option = false ) { } // good function divide(a, b, { option = false } = {}) { } ``` * 使用默認值語法設置函數參數的默認值。 ``` // bad function handleThings(opts) { opts = opts || {}; } // good function handleThings(opts = {}) { // ... } ```
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