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Grokking the Coding Interview Patterns in JavaScript

Encode and Decode Strings

Explore how to create encode and decode methods that transform arrays of strings into a single string and retrieve them back. Understand the constraints, character handling, and the use of bitwise manipulation to implement efficient data encoding and decoding within JavaScript.

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Statement

Create a method, encode, that converts an array of strings into a single string and then sends it over the network. Create another method, decode, that takes the encoded string and converts it back into the original array of strings.

Constraints:

  • 1≤1 \leq strings.length ≤100\leq 100
  • 0≤0 \leq strings[i].length ≤100\leq 100
  • strings[i] consist of any possible combinations of characters from 256 valid ASCII characters.

Examples

Understand the problem

Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

Encode and Decode Strings

1.

What will be the input data type of the encode function?

A.

String

B.

Array of strings

C.

Integer

D.

Boolean

1 / 4

Figure it out!

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Sequence - Vertical
Drag and drop the cards to rearrange them in the correct sequence.
1
2
3
4
5

Try it yourself

Implement your solution in the following coding playground.

JavaScript
usercode > EncodeDecode.js
function encode(strings) {
    // Replace this placeholder return statement with your code
    return ""
}
function decode(string) {
    // Replace this placeholder return statement with your code
    return []
}
export { encode, decode }
Encode and Decode Strings