Question

85

Javascript: Iterating over object and concatenate strings

rated 0 times [ 90] [ 5] / answers: 1 / hits: 14990 / 9 Years ago, thu, september 24, 2015, 12:00:00

I have a Javascript object, which contains other objects. Each of the contained objects has got a name property.

What I would like to do now is to concatenate these name properties to one String. However, I want these Strings separated by commas and an 'and' before the last String.

For better understanding, the object i want to iterate over would look like this:

var objects = {

    o1: {name: 'name1'}, 

    o2: {name: 'name2'},

    o3: {name: 'name3'}

};

Now the String I would like to have in the end would be: 'Concatenation of name1, name2 and name3'

What I've tried so far was using angular.forEach:

var myString = 'Concatenation of ';



angular.forEach(objects, function(o) {

    myString += o.name + ', ';

}

Not hard to notice, that my String would become 'Concatenation of name1, name2, name3, '.

So the real question would be how I can check at which position in my object I am and reacting appropiately by concatenating 'and' instead of a comma or no comma at all. How can I do that?

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antonb

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2 Years ago

answered 9 Years ago bobbyallanh · Accepted Answer

Use a traditional for loop:

var myString = 'Concatenation of ';

var i = 0;

var keys = Object.keys(objects);

for (i =0; i<keys.length; i++) {

   if (i > 0)

      myString += (i < keys.length - 1) ? ', ' : ' and ';

   myString += objects[keys[i]].name;

}