Neil's Note

var arr = [ { key : 'foo' , val : 'bar' }, { key : 'hello' , val : 'world' } ]; var result = arr . reduce ( function ( map , obj ) { map [ obj . key ] = obj . val ; return map ; }, {}); console . log ( result ); // { foo: 'bar', hello: 'world' } Note:   Array.prototype.reduce()  is IE9+, so if you need to support older browsers you will need to polyfill it. from  http://stackoverflow.com/questions/26264956/convert-object-array-to-hash-map-indexed-by-an-attribute-value-of-the-object from  https://lodash.com/docs#indexBy var keyData = [   { 'dir' : 'left' , 'code' : 97 } ,   { 'dir' : 'right' , 'code' : 100 } ] ; _. indexBy ( keyData , 'dir' ) ; // → { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } } _. ind...

在做專案時很常會碰到要有個功能叫做 "瀏覽過的商品" 在我們系統是使用Log來做 使用Shopper_Id去Log中找出對應的商品ID，然後order by Timestamp desc 因為商品ID在Log中很容易重覆，所以可以使用distinct/group by來處理 但問題來了，明明有使用order by Timestamp desc，但順序卻不是我要的? 這是因為order by的欄位並不在我們的group by/distinct中 該如何解決? 使用order by MAX(Timestamp) desc就可以了 意思大概就是在我們Log中找Timestamp最大的來比對 更詳細的可以看國外高手的文章囉 So what is a workaround for this problem – in other words, how can we be more specific to get what we really want? Well, let’s rephrase the problem – what if we say we want to retrieve each salesperson ID sorted by their respective highest dollar amount value ( and only have each salesperson_id returned just once )? This is different than just saying that we want each distinct salesperson ID sorted by their Amount, because we are being more specific by saying that we want to sort by  their respective highest dollar amount value . Hopefully you see the difference. From: http://www.programmerinterview.com/index.php/database-sql/sql-select-distinct-a...

最近再做專案時有遇到使用window.location時被cancel (透過Chrome console的Network看的) 解法目前是看到用setTimeout..如果有人有更好的方式歡迎跟小弟說一下<(_ _)> 如果有能人懂原理也歡迎告知<(_ _)> setTimeout(function(){ window.location="XXX" }, 3000); http://stackoverflow.com/questions/8566222/javascript-window-redirect-doesnt-work-in-chrome-canceled-status

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