常會有找出陣列中是否包含某元素的需求，過去會使用Array.prototype.indexOf() 來處理，但在ES2016 (ES7) 提供了Array.prototype.includes() 新 ... ... <看更多>

length-1; var t = n/2; for (var i = 0; i <= t; i++) { if (a[i] === val || a[n-i] === val) return true; } return false; } function F(a,val) { return a.includes( ... ... <看更多>

The includes() method returns true if an array contains a given element; Otherwise, it returns false . The following illustrates the syntax of the includes() ... ... <看更多>

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Style. Your braces are not styled consistently, and most JavaScript developers find sameline braces more idiomatic. I think it is better form to place your ... ... <看更多>