Posts in 2021
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Most votes on ruby questions 2
May 01, 2021 in FAQ
Most votes on ruby questions 2. #11 How to install a specific version of a ruby gem? #12 Why is it bad style to
rescue Exception => ein Ruby? #13 class << self idiom in Ruby #14 What does %w(array) mean? #15 How to get a random number in Ruby #16 How to check whether a string contains a substring in Ruby #17 How to generate a random string in Ruby #18 Multi-Line Comments in Ruby? #19 Execute a command line binary with Node.js #20 Equivalent of "continue" in RubyRead all the top votes questions and answers in a single page. #11: How to install a specific version of a ruby gem? (Score: 946) Created: 2013-06-10 Tags: ruby, gem Using the command-line gem tool, how can I install a specific version of a gem? #11 …
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Most votes on ruby questions 10
May 01, 2021 in FAQ
Most votes on ruby questions 10. #91 Remove duplicate elements from array in Ruby #92 Case statement with multiple values in each 'when' block #93 In Ruby, how do I skip a loop in a .each loop, similar to 'continue' #94 Why are scripting languages (e.g. Perl, Python, Ruby) not suitable as shell languages? #95 When to use lambda, when to use Proc.new? #96 How to find where a method is defined at runtime? #97 How to implement Enums in Ruby? #98 How to find where gem files are installed #99 Ruby ampersand colon shortcut #100 Difference between "and" and && in Ruby?
Read all the top votes questions and answers in a single page. #91: Remove duplicate elements from array in Ruby (Score: 343) Created: 2011-12-03 Last updated: 2017-09-26 Tags: ruby-on-rails, arrays, ruby, duplicates I have a Ruby array which …
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Most votes on ruby questions 1
May 01, 2021 in FAQ
Most votes on ruby questions 1. #1 How to write a switch statement in Ruby #2 How to check if a value exists in an array in Ruby #3 How to understand nil vs. empty vs. blank in Ruby #4 How to call shell commands from Ruby #5 How to convert a string to lower or upper case in Ruby #6 How to pass command line arguments to a rake task #7 How do I get the current absolute URL in Ruby on Rails? #8 What is attr_accessor in Ruby? #9 How to make –no-ri –no-rdoc the default for gem install? #10 Understanding the Rails Authenticity Token
Read all the top votes questions and answers in a single page. #1: How to write a switch statement in Ruby (Score: 2166) Created: 2009-06-04 Last updated: 2019-11-26 Tags: ruby, switch-statement, conditional-statements How do I write a switch …
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Most votes on reactjs questions 9
May 01, 2021 in FAQ
Most votes on reactjs questions 9. #81 reactjs giving error Uncaught TypeError: Super expression must either be null or a function, not undefined #82 to call onChange event after pressing Enter key #83 ReactNative: how to center text? #84 React Router v4 - How to get current route? #85 React onClick function fires on render #86 Invalid Host Header when ngrok tries to connect to React dev server #87 How to handle the
onKeyPressevent in ReactJS? #88 How to add fonts to create-react-app based projects? #89 How to scroll to an element? #90 How to combine multiple inline style objects?Read all the top votes questions and answers in a single page. #81: reactjs giving error Uncaught TypeError: Super expression must either be null or a function, not undefined (Score: 271) Created: 2015-05-08 Last updated: 2015-05-11 Tags: reactjs, …
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Most votes on reactjs questions 8
May 01, 2021 in FAQ
Most votes on reactjs questions 8. #71 Access props inside quotes in React JSX #72 ReactJS - .JS vs .JSX #73 React PropTypes: Allow different types of PropTypes for one prop #74 How to use componentWillMount() in React Hooks? #75 axios post request to send form data #76 Reactjs setState() with a dynamic key name? #77 TypeScript and React - children type? #78 How to pass data from child component to its parent in ReactJS? #79 When to use ES6 class based React components vs. functional ES6 React components? #80 React proptype array with shape
Read all the top votes questions and answers in a single page. #71: Access props inside quotes in React JSX (Score: 310) Created: 2014-02-10 Last updated: 2019-05-07 Tags: javascript, reactjs, react-props In JSX, how do you reference a value from …
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Most votes on reactjs questions 7
May 01, 2021 in FAQ
Most votes on reactjs questions 7. #61 Updating an object with setState in React #62 babel-loader jsx SyntaxError: Unexpected token #63 React this.setState is not a function #64 React: how to update state.item[1] in state using setState? #65 ReactJs: What should the PropTypes be for this.props.children? #66 Nested routes with react router v4 / v5 #67 Pass props to parent component in React.js #68 How to pass params with history.push/Link/Redirect in react-router v4? #69 React ignores 'for' attribute of the label element #70 How to call loading function with React useEffect only once
Read all the top votes questions and answers in a single page. #61: Updating an object with setState in React (Score: 339) Created: 2017-04-26 Last updated: 2020-03-22 Tags: reactjs, state Is it at all possible to update object’s properties …
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Most votes on reactjs questions 6
May 01, 2021 in FAQ
Most votes on reactjs questions 6. #51 Why is React's concept of Virtual DOM said to be more performant than dirty model checking? #52 React - uncaught TypeError: Cannot read property 'setState' of undefined #53 Adding script tag to React/JSX #54 Programmatically navigate using react router V4 #55 Why calling react setState method doesn't mutate the state immediately? #56 React Router with optional path parameter #57 ReactJS Two components communicating #58 react-router - pass props to handler component #59 useState set method not reflecting change immediately #60 Updating an object with setState in React
Read all the top votes questions and answers in a single page. #51: Why is React's concept of Virtual DOM said to be more performant than dirty model checking? (Score: 378) Created: 2014-01-14 Last updated: 2019-08-14 Tags: javascript, dom, reactjs, …
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Most votes on reactjs questions 5
May 01, 2021 in FAQ
Most votes on reactjs questions 5. #41 React "after render" code? #42 Invariant Violation: Objects are not valid as a React child #43 Invariant Violation: _registerComponent(…): Target container is not a DOM element #44 What is mapDispatchToProps? #45 Template not provided using create-react-app #46 How to fix missing dependency warning when using useEffect React Hook? #47 React Js conditionally applying class attributes #48 How to specify a port to run a create-react-app based project? #49 Rerender view on browser resize with React #50 Setting a backgroundImage With React Inline Styles
Read all the top votes questions and answers in a single page. #41: React "after render" code? (Score: 407) Created: 2014-10-24 Last updated: 2014-10-24 Tags: javascript, reactjs I have an app where I need to set the height of an element …
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Most votes on reactjs questions 4
May 01, 2021 in FAQ
Most votes on reactjs questions 4. #31 Parse Error: Adjacent JSX elements must be wrapped in an enclosing tag #32 Correct modification of state arrays in React.js #33 How to update nested state properties in React #34 React JSX: selecting "selected" on selected <select> option #35 How to add multiple classes to a ReactJS Component? #36 Error: Node Sass version 5.0.0 is incompatible with ^4.0.0 #37 Error Running React Native App From Terminal (iOS) #38 How to push to History in React Router v4? #39 How to update parent's state in React? #40 React - changing an uncontrolled input
Read all the top votes questions and answers in a single page. #31: Parse Error: Adjacent JSX elements must be wrapped in an enclosing tag (Score: 510) Created: 2015-07-08 Last updated: 2019-10-29 Tags: javascript, reactjs, render I am trying to set …
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Most votes on reactjs questions 3
May 01, 2021 in FAQ
Most votes on reactjs questions 3. #21 Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object #22 What's the difference between "super()" and "super(props)" in React when using es6 classes? #23 A component is changing an uncontrolled input of type text to be controlled error in ReactJS #24 Perform debounce in React.js #25 Detect click outside React component #26 ReactJS - Does render get called any time "setState" is called? #27 React.js inline style best practices #28 React - How to get parameter value from query string? #29 Pros/cons of using redux-saga with ES6 generators vs redux-thunk with ES2017 async/await #30 Hide keyboard in react-native
Read all the top votes questions and answers in a single page. #21: Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object (Score: 614) Created: 2015-12-07 Last …