map « Array « Javascript Data Type Q&A

1. javascript - Array.map and parseInt    stackoverflow.com

From the Mozilla Dev Site:

[1,4,9].map(Math.sqrt)

[1,2,3]

['1','2','3'].map(parseInt)

[1, NaN, NaN]

2. javascript - map one array to a second array with a negative index offset    stackoverflow.com

Alright, I'm taking an array, and making another array from it with the only difference being the indexes are displaced by an arbitrary number determined using two reference points (one in ...

3. how to use a complex associative array in javascript?    stackoverflow.com

I need this table http://code.google.com/apis/chart/docs/gallery/qr_codes.html#details in my program and I'm not even sure if an associative array is the way to go given the type (numeric/alphanumeric), number of characters and ...

4. Simulating map/set in Javascript    stackoverflow.com

I have a json object, say box = {}; to which I will keep adding key-values like box['somename'] = somevalue. There may be repetitions of somename and I want the last ...

5. How to create dynamic Map key in javascript?    stackoverflow.com

I have tried to create a map like example below...

var myMap= {"one": 1,"two": "two","three": 3.0};

for (var key in myMap) {

window.alert("myMapmap property \"" + key + "\" = ...

6. JavaScript `new Array(n)` and `Array.prototype.map` weirdness    stackoverflow.com

I've observed this in Firefox-3.5.7/Firebug-1.5.3 and Firefox-3.6.16/Firebug-1.6.2 When I fire up Firebug:

    >>> x = new Array(3)
    [undefined, undefined, undefined]
    >>> y = ...

7. Javascript map array with 'fromCharCode' (character length)    stackoverflow.com

The following is from an interactive session in the Chrome console:

myarray
//-> [67, 65, 84]

String.fromCharCode(67)
//-> "C"

String.fromCharCode(67).length
//-> 1

String.fromCharCode(myarray[0])
//-> "C"

String.fromCharCode(myarray[0]).length
//-> 1

myarray.map(String.fromCharCode)
//-> ["C", "A", "T"]

myarray.map(String.fromCharCode)[0]
//-> "C"

myarray.map(String.fromCharCode)[0].length
//-> 3

8. map nodes to data    stackoverflow.com

I'd like to create a correlation between data and DOM nodes. I tried to directly create a Object, with the nodes as properties, but it looks like only the string representations ...

9. ListOrderedMap/ArrayMap like data structure in Javascript    stackoverflow.com

I'm looking for a JavaScript data structure like ListOrderedMap: http://commons.apache.org/collections/apidocs/org/apache/commons/collections/map/ListOrderedMap.html E.g. It needs to be able add an object at an index, get the index for an object, and able to ...

10. Center Bing Maps V7 around Array of Points    stackoverflow.com

In my Bing Maps V6.3 implementation, I was able to center my map around an array of points using the following code.

map.SetMapView(latlonArray);
if (map.GetZoomLevel() > 10) {
    map.SetZoomLevel(10);
};

11. image map / javascript / array problem    codingforums.com

Hello, I've been messing around with this code and can't get it to work right. I'm a newbie and don't know where the problem could be, maybe even a typo! I butchered the code so many times but I'm out of ideas. At this point, I'm probably missing even more necessary parts to it. Please note: the first code listed WORKS. ...

12. Array.prototype.map = function(func, thisVal)    sitepoint.com