in my code I was always doing
for(i in vector)...
and it always worked, but the problem is that it somehow changed and now my for shows all the values but also the properties, like "remove" that is a function, and it is breaking my whole code.
I don't know why it suddenly changed, because I didn't do anything and I'm getting crazy with this already.
Do you guys know what is happening with my application?
Another thing is that the code only get this problem on my computer.
If I clone my repository again and try it works for while but then starts the problem again.
Thank you.
The in operator has always had this behaviour. Just check that the property exists directly on the object instead of on the prototype:
for (var i in vector) {
if (vector.hasOwnProperty(i)) {
// Property exists on object
}
}
That should solve your issues.
Tom
Related
Maybe I'm not using the right terms/names for my searches but I have not been able to find anything on this topic. I would have thought this would be an easy thing to find. What I'm doing is passing a component name to a function and then trying to use the component's name by attaching a method to it. I have confirmed (via Dev Tools) that the name is correctly being passed but when I use the variable and attach the method the specific request does not work. If I 'hard-code' the exact component name to the method it works perfectly. This makes me think the (various) ways I've been trying to attach the method to the variable name is incorrect (see various attempts below). Can you offer some direction here? Thank you.
Passing to Function ...
const grid_name = "grid_GroupA";
console.log(grid_name); // Shows grid_GroupA
msg_max(newItem, grid_name);
Function (only listing relevant parts)
function msg_max(newItem, grid_target) {
console.log(grid_target); // Shows grid_GroupA
// grid_GroupA.data.add(newItem); // This works ...
// grid_target.data.add(newItem); // This does not work
// (grid_target).data.add(newItem); // This does not work
// [grid_target].data.add(newItem); // This does not work
// grid_target + '.data.add(newItem)'; // This does not work
Thank you ...
Edit ...
In my attempt to provide detail I hope I haven't confused the issue.
In essence, my question is if I can type this exact string
grid_GroupA.data.add(newItem);
and it works for my function, how can I place a variable with the exact string "grid_GroupA" in front of ".data.add(newItem);" and have it seen the same as the line of code that works? Maybe my lack of knowledge here is getting in the way but isn't the line of code that works just a string that is then used to 'find' the object? So, if that assumption is correct, how do I create that same string with the variable? If my assumption is wrong I am a willing learner so I will be all ears. Thank you.
I do not see how grid_target is an object. You are passing grid_name(which is a string) to the function, so grid_target will have no data property, because string doesn't have such a member.
P.S. snake_case is bad option for JavaScript, consider using cameCase instead
I'm extremely new to JavaScript and am attempting to make a very simple game of 'Rock, Paper, Scissors' that is played through the console.
Here is a jsfiddle.net link to the full thing.
The main issue so far is that, every single round, the game will result in a Tie (another one is that incorrect inputs in humanTurn() lead to an error further down the line, but that's not relevant to this topic which I feel is more pressing).
Both humanTurn() and computerTurn() seem to work fine when called individually, however when called within gameRound(), the two console.log()'s (lines 36 and 38) don't seem to be returning a value of any kind, and in the console these show up as ƒ toLocaleUpperCase() { [native code] }. I tried searching for what this could mean, and the only conclusion I've been able to come up with so far is that no value is actually being stored inside of the two variables, AIChoice and HUChoice, and I cannot fathom a reason for why this would be happening.
Any and all help is greatly appreciated!
computerTurn().toLocaleUpperCase and userTurn().toLocaleUpperCase are both functions and since they are on the String prototype, they are both the same function. If you compare them, they will always be equal.
You need to actually call the function in order to get the values you want:
let AIChoice = computerTurn().toLocaleUpperCase();
console.log(AIChoice);
let HUChoice = humanTurn().toLocaleUpperCase();
console.log(HUChoice);
I'm really stuck on this javascript question!
So I'm making a web page that will be completely animated (so it can be used for display for example in a television). That animation will be configurable by the user (stored in a database).
Right now, I've already made the code to store the configuration and to get the configuration (I do an AJAX call and save the configuration in an array of json objects) and everything is as it should be.
The problem is in the animation in which I go through the array and use setTimeout function to create animations. To iterate through the array I rotate it
(I use array.push(array.shift()) according to the answer here).
The first time the intervalmaster function is used, everything goes according to plan, but when the function is called again I need to rotate the array once more (because of the last animation) and the array just doesn't rotate!
Bellow I've left a portion of the code that I'm using that reproduces the problem I'm getting. I've also added the array jsonanima with some possible values (In reality the array is probably much bigger and with higher values).
I really don't understand what is happening, I've also considered that this could be a problem of the multiple setTimeout functions because I've read somewhere (couldn't find the link, sorry!) that is not really advised to use multiple setTimeout.
If that's the case is there any other way to do this?
Thank you in advance!
EDIT: Thanks to the comment from mplungjan I've realized that if change the console.log(jsonanimate) to console.log(JSON.stringfy(jsonanima)) it outputs the correct values (the json array rotated). This got me even more confused! Why do I need to JSON.stringfy to get the array in the correct order?!
Anyway, can't test this with the full code now as I'm not in the office, tomorrow I'll give more feedback. Thank you mplungjan.
EDIT2: Finally solved my problem! So the thing was the call to the function recursivegroup (recursivegroup(0);), this call was made before I rotated the array, so when restarting the animation the array would still have the incorrect values and every sub-sequential value was wrong.
A special thanks to mplungjan and trincot for the comments that helped me debug this problem.
Bellow I leave the code corrected so anybody with the same problem can check it out.
jsonanima=[{"VD":5,"A":10,"diff":0.25},{"L":7,"IE":8,"diff":0.25}];
function intervalmaster(flag){
function recursivegroup(index)
{
if(index==0)
{
//animateeach(jsonanima,0);
}
setTimeout(function(){
//HERE IT WORKS
jsonanima.push(jsonanima.shift());
console.log(JSON.stringify(jsonanima));
//animateeach(jsonanima,0);
//removed the if statement, since it was irrelevant as mplungjan noted
recursivegroup(index+1);
},(jsonanima[0]['diff'])*60*1000);
}
//Changed this
//recursivegroup(0);
var mastertime=0;
for(var key in jsonanima)
{
mastertime+=(jsonanima[key]['diff']);
}
console.log(mastertime,flag);
console.log(JSON.stringify(jsonanima));
if(flag==true)
{
jsonanima.push(jsonanima.shift());
console.log(JSON.stringify(jsonanima));
}
//changed to here
recursivegroup(0);
masterinterval=setTimeout(function(){intervalmaster(true)},mastertime*60*1000);
}
intervalmaster(false);
I seem to be having an issue where using Magnific and then telling it to programmatically go to the provided index breaks, but only when moving to the zeroth element then back.
I've created a codepen here - codepen
This is the code that appears to be the problem especially with the goTo() method.
if (this.items[i].slug === elSlug)
{
this.goTo(i);
}
else
{
// should log every other index other than the one we're looking for
console.log(i);
}
I also noticed that magnific seems to convert the array/objects provided into an items object with more properties and the provided under a data object.
Has anyone had this kind of issue or know of a way around this?
[edit]
It seems to be something to do with the fact that because of how magnific converts the data (after) opening the modal, it needs to be accessed differently, I've tried changing some conditionals but still no joy =/
Your elSlug variable and the slug property are not consistent. For Example, for Sea Salt & Vinegar, elSlug is set to sea-salt-vinegar but its comparing it against sea-salt-&-vinegar, so its not matching properly.
Fixed my problem, with a little help from a friend!
Turns out magnific changes the items[] array when you initialise the modal.
So we don't just have an array of pure data objects we instead have an object with extra data pushed into it as well as Magnfic placing our supplied data under a data object.
This check got me where I needed to go, hope it helps someone else in the future!
for (i ; i < len ; i++) {
if (this.items[i].slug === elSlug || (this.items[i].data && this.items[i].data.slug === elSlug))
{
this.goTo(i);
break;
} else{
// some kind of problem, do other stuff
}
}
Firstoff I'd like to add I've been learning javascript for like only 2 days now. I'm pretty much way ahead of myself with what I'm trying to get but here goes.
I have a json array from which I get data to replace/insert in my page. The first problem I have is that if it comes across an empty ('null') key it will just stop. Will not even try to continu.
document.getElementById("id1")src=json.img1.link;
document.getElementById("id2")src=json.img2.link;
document.getElementById("id3")src=json.img3.link;
json.img2.link is empty ('null' response from json.). javascript will then not replace "id2" but it also won't replace "id3".
I'm now trying to find a solution where it will if nothing else at least set a default.
The script is not continuing executing because it comes to an error --trying to access property link of an undefined object
Try
document.getElementById('id2').src = json.img2 ? json.img2.link : 'defaultLink';
This way your are checking for undefined (ie null) object in img2 and assigning the default value. This assumes that what is not defined (null) is the img2 object.
Actually I don't think your code should work at all, you are missing the. before the src So, try
document.getElementById("id1").src=json.img1.link;
document.getElementById("id2").src=json.img2.link;
document.getElementById("id3").src=json.img3.link;
and let us know if that doesn't solve the problem.
Btw, +points for learning JavaScript and not just straight into jQuery!