Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>with the <code>new Function</code>-syntax, for every function the JS-compiler has to be started to "eval" the function body string - this is slow and should be avoided when possible:</p> <blockquote> <p>Each time […] the Function constructor is called on a string representing source code, the script engine must start the machinery that converts the source code to executable code. This is usually expensive for performance – easily a hundred times more expensive than a simple function call, for example. (Mark ‘Tarquin’ Wilton-Jones)</p> </blockquote> <p>if you had used the search on StackOverflow, you would have found <a href="https://stackoverflow.com/q/3026089/288773">this question</a> wich give very good and detailed information about that.</p> <p><strong>EDIT:</strong> like Martin said in one of the comments below, <em>sometimes</em> the <code>new Function</code>-constructor is a great thing. to list some examples:</p> <ul> <li><a href="http://ejohn.org/blog/javascript-micro-templating/" rel="nofollow noreferrer">John Resigs Micro-Templating Engine</a></li> <li><a href="https://stackoverflow.com/questions/3026089/legitimate-uses-of-the-function-constructor/3026622#3026622">This piece of code from another Question an SO</a></li> <li>to be continued...</li> </ul> <p>but: in 99% of the cases where you <em>could</em> use <code>new Function</code>, it's a bad idea - wich means: to simply define any function that has to be like it is and doesn't have some kind of "dynamic bahavior", you should always use the "normal" function-syntax to speed up your code and avoid the <code>eval</code>-like functionality of <code>new Function</code>.</p>
    singulars
    1. This table or related slice is empty.
    1. POjavascript function vs new Function
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USoezi
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CObut new Function runs even faster! Do you also see what I see?
      singulars
      1. PO
      1. USDan
    2. COwhen i run you tests, i get "10,841,858 / fastest" for `function(){}` and "75,310 / 99% slower" for `new Function` - don't know what you're talking about.
      singulars
      1. PO
      1. USoezi
    3. COUsing ´new Function´ is not bad practice - it is an awesome tool, to be used when it is needed - people using it when it is not needed, that is bad practice. Saying that using ´new Function´ is bad practice is like saying "driving a car is bad practice", because some people run other people over while driving. That said, new Function is slower than a regular function and will always be, end of story.
      singulars
      1. PO
      1. USMartin Jespersen
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload