TELUS Digital Reactjs Developer Interview Questions and Answers

Just MCQ questions related to React, Javascript, HTML, CSS

Q1. 1. Coding question in JS: Capitalize last letter of each word in a string. 2. React JS: Fetch data from some given API and store data in tabular form
Ans. 
Capitalize last letter of each word in a string and fetch data from API to display in tabular form using React JS.
• Split the string into an array of words

• Iterate through each word and capitalize the last letter

• Join the words back together to form the modified string

• Use React JS to fetch data from API and display in a tabular form
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Q1. About CI-CD , JS browser working ,
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Q2. React basics like working and jsx
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Q1. What is closures, Hoisting with example Semantic elements
Ans. 
Closures and hoisting are important concepts in JavaScript.
• Closures refer to the ability of a function to access variables in its outer scope even after the function has returned.

• Hoisting is the behavior of moving variable and function declarations to the top of their respective scopes.

• Example of closures: function outer() { let x = 10; function inner() { console.log(x); } return inner; } const innerFunc = outer(); inn...read more
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Q2. Chaining Methods Currying Call bind and apply Optimization of application Server side rendering
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Q3. Selectors HTML 5 features
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Q1. Javascript array methods like filter and reduce. Javascript guess the output questions based on variables and functions.
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Q2. React lifecycle methods
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Q3. UseState and useEffect usecase
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Q1. What is conditional rendering in React? What are closures? OOPS concept in JavaScript. What is ACID in database? Stack vs Heap
Ans. 
Conditional rendering in React allows components to render different elements or components based on certain conditions.
• Conditional rendering is achieved using JavaScript expressions inside JSX.

• Common conditional rendering techniques include using if statements, ternary operators, and logical && operator.

• Example: rendering a component only if a certain condition is met - {condition ? : null}
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Q2. In react you can conditionally render component like when and which component to render by using if condition and other.
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React js and JavaScript scenarios based problems.