Loop through a 2D array to get second column values

Question

var linkArray = [
['boothsizeDiv_link', false],
['furnishingsprovidedDiv_link', false],
['electricalDiv_link', false],
['rentalfurnishingsDiv_link', false],
['gesgraphicsDiv_link', false],
['geslaborDiv_link', false],
['contractorDiv_link', false],
['carpetingDiv_link', false],
['boothlightingDiv_link', false],
['javitsDiv_link', false],
['boothsealDiv_link', false],
['mannequinsDiv_link', false],
['calcDiv_link', false]
];

How can i loop through this array to get all 'false' values from that array?

Answer 1

use a loop

for (var i=0;i<linkArray.length;i++)
{
 document.write(linkArray[i][1] + "<br>");
}

Answer 2

If you just want a list of boolean values, the you can use this:

var falseValues = [];//this will be your list of false values
for(var i = 0; i < linkArray.length; i++){
 var link = linkArray[i];
 //test the value at array index 1 (i.e. the boolean part)
 if(!link[1]){
 falseValues.push(link[1]);//add the false to the list
 }
}

• Fabien: Do not use for ... in with regular arrays.
• Fabien: It sometimes breaks and is thus considered bad style. You can read stackoverflow.com/questions/500504/… for example.
• Mark Walters: @musefan have a look here stackoverflow.com/questions/500504/…

Answer 3

Judging by the variable name, the string values and the structure of your array, it might be a better approach to use object instead of array:

var linkObject = {
 boothsizeDiv_link: false,
 furnishingsprovidedDiv_link: false,
 electricalDiv_link: false,
 rentalfurnishingsDiv_link: false,
 gesgraphicsDiv_link: false,
 geslaborDiv_link: false,
 contractorDiv_link: false,
 carpetingDiv_link: false,
 boothlightingDiv_link: false,
 javitsDiv_link: false,
 boothsealDiv_link: false,
 mannequinsDiv_link: false,
 calcDiv_link: false
};

Now you can get the array of the boolean values like this:

var ret = [];
for (var propertyName in linkObject) {
 ret.push(linkObject[propertyName]);
}

But you can also get to a specific value like this:

linkObject['boothsizeDiv_link'] 

which yields false.