Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p><strong>Vanilla JS: Remove duplicates using an Object like a Set</strong></p> <p>You can always try putting it into an object, and then iterating through its keys:</p> <pre><code>function remove_duplicates(arr) { var obj = {}; var ret_arr = []; for (var i = 0; i &lt; arr.length; i++) { obj[arr[i]] = true; } for (var key in obj) { ret_arr.push(key); } return ret_arr; } </code></pre> <p><strong>Vanilla JS: Remove duplicates by tracking already seen values (order-safe)</strong></p> <p>Or, for an order-safe version, use an object to store all previously seen values, and check values against it before before adding to an array.</p> <pre><code>function remove_duplicates_safe(arr) { var seen = {}; var ret_arr = []; for (var i = 0; i &lt; arr.length; i++) { if (!(arr[i] in seen)) { ret_arr.push(arr[i]); seen[arr[i]] = true; } } return ret_arr; } </code></pre> <p><strong>ECMAScript 6: Use the new Set data structure (order-safe)</strong></p> <p>ECMAScript 6 adds the new <code>Set</code> Data-Structure, which lets you store values of any type. <code>Set.values</code> returns elements in insertion order.</p> <pre><code>function remove_duplicates_es6(arr) { let s = new Set(arr); let it = s.values(); return Array.from(it); } </code></pre> <p><strong>Example usage:</strong></p> <pre><code>a = ["Mike","Matt","Nancy","Adam","Jenny","Nancy","Carl"]; b = remove_duplicates(a); // b: // ["Adam", "Carl", "Jenny", "Matt", "Mike", "Nancy"] c = remove_duplicates_safe(a); // c: // ["Mike", "Matt", "Nancy", "Adam", "Jenny", "Carl"] d = remove_duplicates_es6(a); // d: // ["Mike", "Matt", "Nancy", "Adam", "Jenny", "Carl"] </code></pre>
    singulars
    1. This table or related slice is empty.
    1. PORemove duplicate values from JS array
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USDarthfett
    1. USDarthfett
    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. VTApproveEditSuggestion
    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. VTUpMod
    1. This table or related slice is empty.
 

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