{"action":"created","issue":{"url":"https://api.github.com/repos/vuejs/vue/issues/7672","repository_url":"https://api.github.com/repos/vuejs/vue","labels_url":"https://api.github.com/repos/vuejs/vue/issues/7672/labels{/name}","comments_url":"https://api.github.com/repos/vuejs/vue/issues/7672/comments","events_url":"https://api.github.com/repos/vuejs/vue/issues/7672/events","html_url":"https://github.com/vuejs/vue/issues/7672","id":298704947,"number":7672,"title":"Computed documentation does not mention lazy evaluation","user":{"login":"FEA5T","id":2647403,"avatar_url":"https://avatars3.githubusercontent.com/u/2647403?v=4","gravatar_id":"","url":"https://api.github.com/users/FEA5T","html_url":"https://github.com/FEA5T","followers_url":"https://api.github.com/users/FEA5T/followers","following_url":"https://api.github.com/users/FEA5T/following{/other_user}","gists_url":"https://api.github.com/users/FEA5T/gists{/gist_id}","starred_url":"https://api.github.com/users/FEA5T/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/FEA5T/subscriptions","organizations_url":"https://api.github.com/users/FEA5T/orgs","repos_url":"https://api.github.com/users/FEA5T/repos","events_url":"https://api.github.com/users/FEA5T/events{/privacy}","received_events_url":"https://api.github.com/users/FEA5T/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2018-02-20T18:43:55Z","updated_at":"2018-02-20T21:55:27Z","closed_at":"2018-02-20T19:22:48Z","author_association":"NONE","body":"### What problem does this feature solve?\r\nTruth is: Computed variables are evaluated lazily.\r\n\r\nDocumentation says: Computed props are evaluated any time the underlying data is changed.\r\n\r\nDifference is, computed props are often not re-evaluated when underlying data changes (when in development for example, and no template yet consumes it, or, when hidden due to conditional rendering)\r\n\r\n\r\n\r\n### What does the proposed API look like?\r\nPlease add a special note/caveat (red exclamation point), explaining the lazy evaluation of computed props, and suggest that a watcher be used if continuous evaluation is required.\r\n\r\n<!-- generated by vue-issues. DO NOT REMOVE -->"},"comment":{"url":"https://api.github.com/repos/vuejs/vue/issues/comments/367133713","html_url":"https://github.com/vuejs/vue/issues/7672#issuecomment-367133713","issue_url":"https://api.github.com/repos/vuejs/vue/issues/7672","id":367133713,"user":{"login":"FEA5T","id":2647403,"avatar_url":"https://avatars3.githubusercontent.com/u/2647403?v=4","gravatar_id":"","url":"https://api.github.com/users/FEA5T","html_url":"https://github.com/FEA5T","followers_url":"https://api.github.com/users/FEA5T/followers","following_url":"https://api.github.com/users/FEA5T/following{/other_user}","gists_url":"https://api.github.com/users/FEA5T/gists{/gist_id}","starred_url":"https://api.github.com/users/FEA5T/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/FEA5T/subscriptions","organizations_url":"https://api.github.com/users/FEA5T/orgs","repos_url":"https://api.github.com/users/FEA5T/repos","events_url":"https://api.github.com/users/FEA5T/events{/privacy}","received_events_url":"https://api.github.com/users/FEA5T/received_events","type":"User","site_admin":false},"created_at":"2018-02-20T21:55:27Z","updated_at":"2018-02-20T21:55:27Z","author_association":"NONE","body":"@yyx990803  True or false:\r\n\r\nIf a computed property is not used in dom or anywhere else, it will not re-evaluate even when data changes."}}
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