Скачать или смотреть How to Convert a String to an Array in Javascript without Built-in Methods

Discover how to transform a string into an array in Javascript without using built-in methods like split(), and understand the logic behind the solution step-by-step.
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Transforming a String into an Array in Javascript

Converting a string into an array is a common requirement in programming, especially when dealing with text data. However, what if you need to accomplish this task without using built-in methods, such as split()? In this guide, we will explore how you can convert a string into an array using pure Javascript code, focusing on a method that takes a single parameter.

The Problem Statement

Imagine you have a string like this:

[[See Video to Reveal this Text or Code Snippet]]

Your goal is to convert this string into an array that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Additionally, you will need to ensure that you don’t use any built-in methods such as split(), and keep your function tailored to only one input parameter.

Solution Overview

To achieve this, we will write a custom function called stringToArray that will loop through the characters in the string, detecting spaces as delimiters for separate words. Here’s how we can break down the solution:

Steps to Create the Function

Initialize an Array: We will start with an array containing an empty string.

Loop Through each Character: Using a for loop, we will iterate through each character of the input string.

Check for Spaces: If we encounter a space, we will move to the next element of the array.

Build Word Segments: If the character is not a space, we will build up the current word in the array's current position.

Return the Final Array: Finally, we will return the constructed array.

The Code Implementation

Here’s the code that implements the above steps:

[[See Video to Reveal this Text or Code Snippet]]

Understanding the Code

Let's break down the key components of the code:

Initialization: We start with let arr = [''];, which means our array begins with an empty string so that we have a place to start building the first word.

Character Looping: The line for (let i = 0; i < str.length; i+ + ) allows us to check each character in the string one at a time.

Condition for Spaces: Within the loop, if (str.charAt(i) == " ") checks if the current character is a space. If it is, we increment our index j to move to the next position in the array.

Building Words: When we encounter a non-space character, arr[j] + = str.charAt(i); adds that character to the current word in our array.

Conclusion

Congratulations! You just learned how to convert a string into an array in Javascript using a custom function and without relying on any built-in methods. This method gives you greater control over string manipulation and a deeper understanding of how to work with arrays and strings in Javascript.

This function can be quite flexible and serves as a great example of how to solve problems creatively in programming.

Feel free to experiment with your own strings and see how this function behaves!