Signiwis Technologies UI Developer Interview Questions and Answers

Q1. How does the virtual DOM improve performance?
Ans. 
The virtual DOM improves performance by minimizing the number of updates needed to the actual DOM.
• Virtual DOM allows for efficient batch updates to the actual DOM, reducing the number of reflows and repaints.

• It compares the virtual DOM with the actual DOM and only updates the necessary changes, instead of re-rendering the entire DOM tree.

• This results in faster rendering and better performance, especially for complex UI
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Q2. It minimize direct DOM updates, reducing reflows are repaints.
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Q1. Reverse a String in Javascript
Ans. 
To reverse a string in Javascript, we can use the built-in reverse() method.
• Convert the string to an array using split() method

• Use the reverse() method to reverse the array

• Convert the reversed array back to a string using join() method
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Q1. Explain difference between inline and inline block
Ans. 
Inline elements do not start on a new line and only take up as much width as necessary, while inline-block elements can have a width and height set.
• Inline elements do not start on a new line and only take up as much width as necessary

• Inline-block elements can have a width and height set

• Inline elements ignore top and bottom margins and padding, while inline-block elements respect them
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Q2. Described semantic html
Ans. 
Semantic HTML is a way of writing HTML that focuses on the meaning of the content rather than its appearance.
• Semantic HTML uses tags that clearly define the purpose of the content, such as <header>, <footer>, <nav>, <article>, <section>, <aside>, <main>.

• It helps improve accessibility for users with disabilities by providing more context to screen readers and other assistive tec...read more
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Q1. Indroduction
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Q1. React State Management
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Q2. State vs Props, Redux, Routing
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Q1. For loop fine the array value
Ans. 
Using a for loop to find a specific value in an array of strings.
• Use a for loop to iterate through the array

• Check each element to see if it matches the desired value

• Return the index of the matching element or -1 if not found
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Q2. For loop fine the array valu
Ans. 
To find array values using for loop
• Declare a variable to store the sum of array values

• Use a for loop to iterate through the array

• Access each element using array[index] syntax

• Add the element value to the sum variable

• Return the sum variable
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