1; ; A couple of weeks ago, though, someone created a ticket for Prototype. Js proposing an Date method. An implementation used constructor check and so was vulnerable to you cross-frame issues. This is when I remembered about getClass and its possible usage in isArray, isDate and other similar methods. Specs mention that: new Array( item0, item1.) The Class property of the newly constructed object is set to Array. This means that creating isArray function could not be simpler than: function isArray(o) return ll(o) 'object Array the solution is not dependent on frames (since it checks internal Class) and is more robust than duck-typing approach. I have tested it on a handful of browsers (including some archaic and mobile ones) and was happy to find that all of them are indeed compliant in this regard. Lets hope this little trick serves as a remedy to cross-frame issues that authors struggle to find workarounds for : ) Happy new year!
Get the Class property of this object. Compute a string value by concatenating the three strings object result (1 and ". Return Result (2) Contrary to String which is implementation dependent and is not recommended to be relied upon, String has a clearly defined behavior for all native objects. String An implementation-dependent representation of the function is returned. This representation has the syntax of a functionDeclaration. Note in particular that the use and placement of white space, line terminators, and semicolons within the representation string is implementation-dependent. Just as essays a fun exercise, i wrote a simple _getClass method, put it into an experimental folder and forgot about it : ) function _getClass(object) return ll(object).match objects(.
Pretty, diff - guide: How to write a parser
This statement returns true because ototype (being a prototype property of a right-hand object) references the same object as an internal Prototype of left-hand object (Prototype is visible via papers arr._proto_ in clients that have _proto_ extension). An alternative constructor check, which I mentioned earlier, would usually look like: var arr ; nstructor Array; / true, both instanceof and constructor look very innocent and seem like great ways to check if an object is an array. If I remember correctly, latest jQuery is using constructor: An excerpt from jQuery (rev. IsArray: function( arr ) return! The problems arise when it comes to scripting in multi-frame dom environments. In a nutshell, Array objects thesis created within one iframe do not share Prototypes with arrays created within another iframe.
Their constructors are different objects and so both instanceof and constructor checks fail: var iframe eateElement iframe. AppendChild(iframe xArray ray; var arr new xArray(1,2,3 / 1,2,3 / boom! Arr instanceof Array; / false / boom! Nstructor Array; / false, this problem was mentioned by Crockford as far as back in 2003. Doug suggested to try duck-typing and check for a type of one of the ototype methods. G.: typeof rt 'function'.
Good old typeof operator is often useless when it comes to certain types of values: typeof null; / "object" typeof ; / "object people often expect to see something like null in the former check and something like array in the latter one. Fortunately, checking for null is not that hard, despite useless typeof, and is usually accomplished by strict-comparing value to null: value null; Checking for arrays, on the other hand, is a somewhat tricky business. There are usually two schools of thought using instanceof operator (or checking objects constructor property) and the-duck-typing way checking for presence (or types) of certain set of properties (which are known to be present in array objects). Obviously, both ways have their pros and cons. 1) instanceof operator / constructor property instanceof operator essentially checks whether anything from left-hand objects prototype chain is the same object as whats referenced by prototype property of right-hand object. It sounds somewhat complicated but is easily understood from a simple example: var arr ; arr instanceof Array; / true.
Jquery - prettier way to write this script (Hide span on click
Once the habit is in place, you can lengthen it, but for now just start. You can write in a journal or text document just for yourself, but I highly recommend blogging. Get a free account at. Tumblr, and just start. Because it really helps you to the write regularly, and forces you to think in different ways, when you have an audience. Even if the audience is small. Its scary, i know, but just. Youll grow comfortable with it over time, and you should never let fear stop you from doing something amazing. The writer is best friends with distraction.
And then actually stick to this commitment. Set aside the time. You have to block off a small chunk of time for this, or it wont happen. I suggest morning, as soon as you can, so that other things dont get in the way. However, if youre a night owl, late synthesis nights are fine too, as long as youre not too tired. Ok, you knew I was going to say this, but its really important. All you have to do is start writing each day — you dont have to write 1,000 words or anything. Just start, and how much you do doesnt matter.
online helps you to build an audience who is interested in what you have to share, and how you can help them. This is good for any business, anyone who is building a career, anyone who loves to socialize with others who are interested in similar things as them. And thats just the start. The full benefits of this regular habit are, ironically, not something you can put into words, but something that must be experienced to be known. How to Write daily, there are various ways to get into the daily writing habit, but heres what Id recommend based on my experience: Commit to writing daily. Many people try to write a few times a week, or once a week. Thats too infrequent and it wont become a habit that way. Instead, tell yourself, Im going to write every single day, no exceptions.
Writing regularly makes you better at writing. And writing is a powerful skill to be good at in our digital age. Writing for an audience (even if the audience is just one person) helps you to think from the perspective of the audience. Thats when the magic starts, because once you get into the readers mindset, you begin to understand readers and customers and colleagues and friends better. You have empathy and a wider understanding of the world. Writing persuasively — to convince others of your point of view — helps you to get better at persuading people to change their minds. Many people dont want to change their minds when they feel someone is attacking their position, so they get defensive and dig into their position. Writing daily forces you to come up with paper new ideas regularly, and so that forces you to solve the very important problem of where to get ideas. Whats the answer to that problem?
Proper way to write a lot /
By, leo babauta, one of the most instrumental changes in my homework life has been writing every single day. For many years I was a writer who didnt write that regularly. It was always on the back of my mind to write, but I didnt find the time. Then I started this blog in January 2007, and have written pretty much every day since then. I recommend daily writing for anyone, not just writers. Heres what ive found from my daily habit: Writing helps you reflect on your life and changes youre making. This is incredibly valuable, as often we do things without realizing why, or what effects these things are having. Writing clarifies your thinking. Thoughts and feelings are nebulous happenings in our mind holes, but writing forces us to crystalize those thoughts and put them in a logical order.