Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>First, you need to not reassign the <code>options</code> argument to a var. Second, be careful with this for certain values:</p> <pre><code>var foo = function (options) { options = options || {}; var bar = options.bar || 42; var baz = options.baz || 'fubar'; }; foo({ bar: 0, baz: "" }); </code></pre> <p>Inside <code>foo</code>, <code>bar == 42</code> &amp; <code>baz == 'fubar'</code> because <code>0</code> and <code>""</code> are falsy. It's probably better to be more verbose so as to be more precise:</p> <pre><code>var foo = function (options) { options = options || {}; var bar = typeof options.bar == 'undefined' ? 42 : options.bar; var baz = typeof options.baz == 'undefined' ? 'fubar' : options.baz; }; </code></pre> <p>But, to be DRY, you can create a <code>defaults</code> object and just extend both objects to a <code>settings</code> object:</p> <pre><code>// generic shallow object extension, mutates obj1 var extend = function (obj1, obj2) { for (var prop in obj2) { if (obj2.hasOwnProperty(prop)) { obj1[prop] = obj2[prop]; } } return obj1; }; var foo = function (options) { var defaults = { bar: 42, baz: 'fubar' }, settings = extend(defaults, options); }; </code></pre> <p>Since you won't be using <code>defaults</code> any more in this invocation it doesn't matter that it gets mutated. Using this method:</p> <pre><code>foo(); // -&gt; settings = { bar: 42, baz: 'fubar' } foo({ bar: 0 }); // -&gt; settings = { bar: 0, baz: 'fubar' } foo({ bar: 0, baz: "" }); // -&gt; settings = { bar: 0, baz: '' } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POGuarding against undefined parameters
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USmVChr
    1. USmVChr
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POGuarding against undefined parameters
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. CO+1 for mentioning falsey values (and extend)
      singulars
      1. PO
      1. USJonathon Bolster
    2. COUse `Object.keys` instead of a `for ... in` loop because it's about 9 times faster
      singulars
      1. PO
      1. USRaynos
    3. COSome type checking added to `extend()` would be really nice.
      singulars
      1. PO
      1. USchelmertz
 

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