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配列をちょっと拡張
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// ==UserScript== // @name ArrayEx // @namespace phadra // @version 0.4 // @description 配列をちょっと拡張 // @grant none // @downloadURL none // ==/UserScript== (function() { // 配列拡張 Array.prototype.first = function(i) { return this[0]; }; Array.prototype.last = function(i) { return this[this.length-1]; }; Array.prototype.item = function(i) { return i>=0 && i<this.length ? this[i] : null; }; Array.prototype.round = function(i) { return this[i<0? 0: i>=this.length? this.length-1: i]; }; Array.prototype.loop = function(i) { return this[i<0? this.length-1: i>=this.length? i%(this.length-1): i]; }; })();