A re-introduction to JavaScript - MDC - The Diigo Meta page

• 06 May 12
  

  rafael bernardi

  programação javascript

• 04 Jul 10
  

  raviagarwal101

  Front End

• 22 Jun 10
  

  Pedro Ângelo

  Why a re-introduction? Because JavaScript has a reasonable claim to being the world's most misunderstood programming language. While often derided as a toy, beneath its deceptive simplicity lie some powerful language features.

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• 01 Dec 08
  

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• 15 Oct 08
  

  Jeff Roush

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• 10 Oct 08
  

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  • Why a re-introduction? Because JavaScript has a reasonable claim to being the world's most misunderstood programming language. While often derided as a toy, beneath its deceptive simplicity lie some powerful language features. 2005 has seen the launch of a number of high-profile JavaScript applications, showing that deeper knowledge of this technology is an important skill for any web developer.
• 07 Oct 08
  

  kind one

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• 21 Sep 08
  

  Rajat Mittal

  Javascript Array

  • If you take the above into account, you can iterate over an array using the following: 

     

    for (var i = 0; i < a.length; i++) {     // Do something with a[i] } 

     

    This is slightly inefficient as you are looking up the length property once every loop. An improvement is this: 

     

    for (var i = 0, len = a.length; i < len; i++) {     // Do something with a[i] } 

     

    An even nicer idiom is: 

     

    for (var i = 0, item; item = a[i]; i++) {     // Do something with item } 

     

    Here we are setting up two variables. The assignment in the middle part of the for loop is also tested for truthfulness - if it succeeds, the loop continues. Since i is incremented each time, items from the array will be assigned to item in sequential order. The loop stops when a "falsy" item is found (such as undefined). 

    Note that this trick should only be used for arrays which you know do not contain "falsy" values (arrays of objects or DOM nodes for example). If you are iterating over numeric data that might include a 0 or string data that might include the empty string you should use the i, j idiom instead. 

    Another way to iterate is to use the for...in loop. Note that if someone added new properties to Array.prototype, they will also be iterated over by this loop: 

     

    for (var i in a) {   // Do something with a[i] } 
• 18 Sep 08
  

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• 12 Sep 08
  

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  Why a re-introduction? Because JavaScript has a reasonable claim to being the world's most misunderstood programming language. While often derided as a toy, beneath its deceptive simplicity lie some powerful language features. 2005 has seen the launch of

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  Andrew White

  Why a re-introduction? Because JavaScript has a reasonable claim to being the world's most misunderstood programming language. While often derided as a toy, beneath its deceptive simplicity lie some powerful language features. 2005 has seen the launch of

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• 11 Sep 08
  

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• 10 Sep 08
  

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  Why a re-introduction? Because JavaScript has a reasonable claim to being the world's most misunderstood programming language. While often derided as a toy, beneath its deceptive simplicity lie some powerful language features.

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• 09 Sep 08
  

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