How do you remove the last character from a string in JavaScript using the substring() function?

Trimming the Last Character from a String in JavaScript

In JavaScript, there are various ways to trim the last character from a string. One commonly used method is the substring() function.

To understand how substring() works, let's consider the example in the question: 12345.00. To remove the last character, we pass two arguments to substring():

<code class="javascript">str.substring(0, str.length - 1);</code>

The first argument, 0, specifies the starting index (inclusive). Since we're starting from the beginning of the string, we use 0. The second argument, str.length - 1, specifies the ending index (exclusive). Subtracting 1 removes the last character.

The result of str.substring(0, str.length - 1) would be 12345.0. This method is particularly useful when you need to remove a specific character or substring from a string.

Here's a step-by-step breakdown of the code:

1. Initialize the string: Create a string variable, str, and assign it the value 12345.00.

2. Use substring(): Call the substring() method on str with two arguments:

   • The starting index, 0 (inclusive).
   • The ending index, str.length - 1 (exclusive), which removes the last character.
3. Log the result: Log the modified string, 12345.0, to the console using console.log().

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