Skip to content
Advertisement

Tag: arrays

Is a JavaScript array index a string or an integer?

I had a generic question about JavaScript arrays. Are array indices in JavaScript internally handled as strings? I read somewhere that because arrays are objects in JavaScript, the index is actually a string. I am a bit confused about this, and would be glad for any explanation. Answer That is correct so:

How to initialize a boolean array in javascript

I am learning javascript and I want to initialize a boolean array in javascript. I tried doing this: But it doesn’t work. After googling I only found this way: But I find this a very difficult way just to initialize an array. Any one knows another way to do that? Answer You were getting an error with that code that

A Vector Class in Javascript

I’m trying to implement a vector object instantiated like below… …and when I do a math operation I need something like this… …but my code below returns me just an array Please help me out here. Thank you! Answer You need to wrap up your resulting array in a new Vector object: I should note also that you may want

indexOf() when array-elements are objects (javascript)

For instance, a variable named arrayElements of type array contains: [{id:1, value:5},{id:2, value:6},{id:3, value:7},{id:4, value:8}]. How do I get the position of the array element with id === 3(3rd element) in the arrayElements variable besides using loop? thanks. Answer You have to loop at one point. But you can abstract it to look like you’re not looping As mentioned by

Return index value from filter method javascript

I have an array of objects in my angular controller. I want to return the value of the index of the field within the array which has a matching ID to my parameter. There will only be one object in the array with a matching fieldId.. Answer You can’t return index from filter method. The filter() method creates a new

JSON – how to parse it?

I just got a problem about this response. Supposedly if I want to choose item from the response it must be an array value. Actually must be like this one right? (let me know if I’m mistaken) My code: Then I want to put telegraphicTransferBankMapItem.xxxxxx as bankId and telegraphicTransferBankMapItem.yyyyyyy as bankName. Answer Use your first json and change your loop

Advertisement