Frequently asked questions and answers of CoffeeScript in Artificial Intelligence and Machine Learning of Computer Science to enhance your skills, knowledge on the selected topic. We have compiled the best CoffeeScript Interview question and answer, trivia quiz, mcq questions, viva question, quizzes to prepare. Download CoffeeScript FAQs in PDF form online for academic course, jobs preparations and for certification exams .
Intervew Quizz is an online portal with frequently asked interview, viva and trivia questions and answers on various subjects, topics of kids, school, engineering students, medical aspirants, business management academics and software professionals.
Question-1. What is Less in web development?
Answer-1: Less (Leaner Style Sheets) is a CSS preprocessor that extends CSS with dynamic features like variables, mixins, and functions to make stylesheet management more efficient.
Question-2. What are the key features of Less?
Answer-2: Key features include variables, nesting, mixins, functions, operations, and importing of other Less files.
Question-3. How do you declare a variable in Less?
Answer-3: Variables in Less are declared using the @ symbol. Example: @primary-color: #ff0000;.
Question-4. How does nesting work in Less?
Answer-4: Nesting in Less allows CSS selectors to be written in a hierarchical manner. Example: div { p { color: red; } } compiles to div p { color: red; }.
Question-5. What are mixins in Less?
Answer-5: Mixins are reusable blocks of styles that can be included in other selectors. Example: .rounded { border-radius: 5px; } div { .rounded; }.
Question-6. Can Less compile into standard CSS?
Answer-6: Yes, Less compiles into standard CSS using tools like Node.js, Less.js, or build tools like webpack and gulp.
Question-7. How do you include one Less file into another?
Answer-7: Use the @import statement. Example: @import "styles.less";.
Question-8. What is a parametric mixin in Less?
Answer-8: Parametric mixins accept parameters to make them dynamic. Example: .box(@width, @height) { width: @width; height: @height; }.
Question-9. What are operations in Less?
Answer-9: Operations allow mathematical calculations with values. Example: width: 100% / 3;.
Question-10. What is the difference between Less and Sass?
Answer-10: Less uses JavaScript for compilation, while Sass uses Ruby or Dart. Less uses @ for variables, whereas Sass uses $.
Question-11. How do you use functions in Less?
Answer-11: Less includes built-in functions like lighten, darken, and fade. Example: color: lighten(@primary-color, 20%);.
Question-12. What are guards in Less?
Answer-12: Guards are conditional statements in mixins. Example: .mixin (@size) when (@size > 10) { font-size: @size; }.
Question-13. What are Escaping and Interpolation in Less?
Answer-13: Escaping uses the ~"" syntax to prevent compilation. Interpolation uses @{} to dynamically insert variables. Example: ~"@media screen" or @{variable-name}.
Question-14. How can you create loops in Less?
Answer-14: Use recursive mixins to create loops. Example: .loop (@index) when (@index > 0) { .loop(@index - 1); }.
Question-15. Can you use JavaScript expressions in Less?
Answer-15: Yes, you can embed JavaScript expressions using backticks. Example: @random: Math.random();.
Question-16. How do you extend a class in Less?
Answer-16: Use the :extend feature. Example: .button { &:hover:extend(.hoverable); }.
Question-17. What is the difference between @import in Less and CSS?
Answer-17: In Less, @import can include both CSS and Less files. In CSS, it only supports CSS files.
Question-18. How does Less handle scope for variables?
Answer-18: Variables in Less are lexically scoped, meaning their availability is based on where they are declared.
Question-19. How do you define default values for variables in Less?
Answer-19: Use the !default flag. Example: @primary-color: #000 !default;.
Question-20. What tools can you use to compile Less?
Answer-20: Tools include Less.js, Node.js with the less package, webpack, gulp, and other build systems.
Question-21. How do you create a mixin that outputs multiple styles?
Answer-21: Combine multiple properties inside the mixin. Example: .shadow { box-shadow: 0 4px 6px; -webkit-box-shadow: 0 4px 6px; }.
Question-22. What is the & symbol used for in Less?
Answer-22: The & symbol represents the parent selector in nesting. Example: .button { &:hover { color: red; } }.
Question-23. Can Less handle browser-specific prefixes?
Answer-23: Yes, but it does not add them automatically. You can use mixins or tools like Autoprefixer for automation.
Question-24. How do you make a variable global in Less?
Answer-24: Declare the variable outside any selectors or blocks to make it global.
Question-25. What is the @arguments keyword used for in Less?
Answer-25: The @arguments keyword captures all arguments passed to a mixin. Example: .mixin (@args...) { @arguments; }.
Question-26. What is the difference between Less and plain CSS?
Answer-26: Less extends CSS with features like variables, mixins, nesting, and operations, making it more dynamic and reusable.
Question-27. How do you debug errors in Less?
Answer-27: Use tools like the Less CLI, browser dev tools, or sourcemaps to debug compilation errors.
Question-28. How do you use conditionals in Less?
Answer-28: Use guards in mixins or when statements. Example: .mixin (@val) when (@val > 10) { ... }.
Question-29. Can Less optimize CSS output?
Answer-29: Less itself does not optimize output, but you can use CSS minifiers like PostCSS or build tools for optimization.
Question-30. What is a lazy-loaded variable in Less?
Answer-30: Variables in Less are lazily evaluated, meaning their value is determined when referenced, not at declaration time.
Question-31. How do you convert a Less file to a CSS file?
Answer-31: Use the Less compiler, CLI, or build tools to compile .less files into .css. Example: lessc styles.less styles.css.
Question-32. What are inline styles in Less?
Answer-32: Inline styles allow embedding CSS styles within HTML tags, but Less compiles only into stylesheets, not inline styles.
Question-33. What is the difference between variables in Less and Sass?
Answer-33: Less uses @ for variables, whereas Sass uses $. Less variables are evaluated lazily, while Sass variables are evaluated when declared.
Question-34. What is the file extension for Less files?
Answer-34: Less files use the .less file extension.
Question-35. Can you use external libraries with Less?
Answer-35: Yes, you can import external Less libraries using @import.
Question-36. What are comments in Less?
Answer-36: Comments can be single-line (//) or multi-line (/* ... */). Single-line comments are not compiled to CSS.
Question-37. How do you handle errors during Less compilation?
Answer-37: Check the error logs or messages generated by the compiler and use tools like linting for syntax errors.
Question-38. How do you structure large Less projects?
Answer-38: Structure large projects by dividing styles into separate .less files and importing them into a main file. Example: @import "buttons.less";.
Question-39. What is the syntax for including multiple mixins in Less?
Answer-39: Use space-separated mixins. Example: .box-shadow; .border-radius;.
Question-40. What are the benefits of using Less in a project?
Answer-40: Benefits include modularity, code reusability, maintainability, and the ability to use advanced CSS-like features.
Question-41. How do you perform conditional imports in Less?
Answer-41: Use @import (optional) "file.less"; to import a file only if it exists.
Question-42. How does Less support color manipulation?
Answer-42: Less has built-in functions like darken, lighten, and fade for manipulating colors.
Question-43. How do you use inline JavaScript in Less?
Answer-43: Inline JavaScript can be used with backticks. Example: @random: Math.random();.
Question-44. What is the difference between @import and @include in Less?
Answer-44: Less only uses @import for including files, whereas @include is not a feature of Less (it's used in Sass).
Question-45. How do you create responsive design with Less?
Answer-45: Use media queries and parametric mixins to define breakpoints and reusable rules, e.g., .responsive(@width) { @media (max-width: @width) { ... } }.
Question-46. How do you avoid deep nesting in Less?
Answer-46: Avoid deep nesting by restructuring CSS and splitting rules into separate mixins or partials.
Question-47. What are the built-in namespaces in Less?
Answer-47: Less has built-in namespaces like escape, unit, and color manipulation functions like lighten and darken.
Question-48. How does Less handle circular imports?
Answer-48: Less does not support circular imports and will throw an error during compilation.
Question-49. What is the scope of variables in Less?
Answer-49: Variables in Less are lexically scoped, meaning their scope is determined by where they are declared in the stylesheet.
Question-50. How does Less help in maintaining large stylesheets?
Answer-50: Less helps maintain large stylesheets through modularization, reusability with mixins, variables, and nesting.
Frequently Asked Question and Answer on CoffeeScript
CoffeeScript Interview Questions and Answers in PDF form Online
CoffeeScript Questions with Answers
CoffeeScript Trivia MCQ Quiz
