clone | 易学教程

How to clone ES6 generator? [duplicate]

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问题 This question already has answers here : Implementing monads in JavaScript (3 answers) Closed 5 months ago . I'm trying to create a List monad in ES6 using generators. To make it work I need to create a copy of an iterator that has already consumed several states. How do I clone an iterator in ES6? function* test() { yield 1; yield 2; yield 3; } var x = test(); console.log(x.next().value); // 1 var y = clone(x); console.log(x.next().value); // 2 console.log(y.next().value); // 2 (sic) I've

Rails clone copy or duplicate

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问题 I have a nested form and once I save, I want to be able to click a link on the show page to copy or clone that form and open a new one. From there I should be able to make edits (like a new id) and save as a new record. I have seen some examples like this deep_cloneable gem, but I have no idea how to implement it. I think this should be simple, but I just don't understand where to put things in the controller and in the show view. 回答1: If you want to copy an activeRecord object you can use

When converting from SVN to Git, how do I put the revision number in the commit message?

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We will be converting our repository from Subversion to Git, but would like to be able to retain the SVN revision number as comments in the bug tracker regularly reference it. We will be using git svn clone and the process described in John Albin's blog . Is there a way to include the revision number in the commit message? I'd prefer to do it during the clone, but a post-processing step would be acceptable. Yes, I know about git svn find-rev , but that requires the SVN repository stick around and the user has network access to it. git svn does this by default: it normally includes a line in

How to deep clone the state and roll back in Vuex?

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In Vuex I would like to take a snapshot / clone of an object property in the tree, modify it, and later possibly roll back to the former snapshot. Background: In an application the user can try out certain changes before applying them. When applying the changes, they should effect the main vuex tree. The user can also click «cancel» to discard the changes and go back to the former state. Example: state: { tryout: {}, animals: [ dogs: [ { breed: 'poodle' }, { breed: 'dachshund' }, ] ] } User enters »Try out« mode and changes one breed from poodle to chihuahua . She then decides either to

jQuery .wrap() not wrapping around a cloned element

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问题 (function($) { $.extend({ notify: function(options, duration) { var defaults = { inline: true, href: '', html: '' }; var options = $.extend(defaults, options); var body = $('body'), container = $('<ul></ul>').attr('id', 'notification_area'), wrapper = '<li class="notification"></li>', clone; if (!body.hasClass('notifications_active')) { body.append(container).addClass('notifications_active'); } if (options.inline == true && options.href) { clone = $(options.href).clone().wrap(wrapper); }

What is the easiest way to deeply clone (copy) a mutable Scala object?

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问题 What is the easiest way to deeply clone (copy) a mutable Scala object? 回答1: Since you want the easiest way to deep copy a Scala object and not the fastest, you can always serialize the object, provided that it's serializable, and then deserialize it back. The following code only runs when compiled, not in REPL. def deepCopy[A](a: A)(implicit m: reflect.Manifest[A]): A = util.Marshal.load[A](util.Marshal.dump(a)) val o1 = new Something(...) // "Something" has to be serializable val o2 =

How do I reconnect my project to my existing GitHub repository

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I am working on an Xcode project with source control. I messed up so I deleted the project from my laptop, and downloaded (ZIP) my own project which I pushed to GitHub earlier. But now this cloned project is not a git repository (or any of the parent directories): .git Question: How do I reconnect my project to my existing GitHub repository? The easiest is to: clone your GitHub project cd in that local clone do a git --work-tree=/path/to/unzip/project diff to check if your zip has any differences with the version cloned from git hub: if it does, git add and commit. (and by that use git --work

How to clone an inputstream in java in minimal time

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Can someone tell me how to clone an inputstream, taking as little creation time as possible? I need to clone an inputstream multiple times for multiple methods to process the IS. I've tried three ways and things don't work for one reason or another. Method #1: Thanks to the stackoverflow community, I found the following link helpful and have incorporated the code snippet in my program. How to clone an InputStream? However, using this code can take up to one minute (for a 10MB file) to create the cloned inputstreams and my program needs to be as fast as possible. int read = 0; byte[] bytes =

How to Clone Models in Backbone

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问题 I have a model which can be edited by a certain view; however, at the bottom of the view the user should get an option to save or discard all changes. This means that you will need to store a list of all the changes to be made to the model and then make those changes only once the 'save' button has been clicked. This sounds unnecessarily complicated and I have come up with an idea of an alternative approach which is to create a clone of the model and make changes to that in the view. Then if

Cloning a previous version on Heroku

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I'm new to Heroku. After pushing bad code to the server, I used heroku rollback to revert to a previous version. I then tried to clone this rollback to my computer with: git clone git@heroku.com:<project>.git <dir> Unfortunately, this clones the corrupted head, not the rollback. Is there a way to actually clone a specific previous version? When you do rollbacks, the head of your Heroku Git repo will no longer reflect the running state of you app. Check your releases: $ heroku releases Rel Change By When ---- ---------------------- ------------------- ------------- v52 Config add AWS_S3_KEY