How to use replaceall in js

ThereplaceAll() method globally replaces the specified substring in a JavaScript string, replacing all matching substrings with the given replacement string. The usage method is string.replaceAll(searchValue, replaceValue), where searchValue is the substring to be replaced and replaceValue is the new string to be replaced.

replaceAll() usage in JavaScript

Question: replaceAll() in JavaScript ) method does what?

Answer: The replaceAll() method is used to globally replace the specified substring in a string. It replaces all matching substrings in a string with the given replacement string.

Usage:

<code class="js">string.replaceAll(searchValue, replaceValue);</code>

Where:

• ##string is the original string to be replaced.
• searchValue is the substring to be replaced.
• replaceValue is the new string to replace the substring.

Example:

<code class="js">const str = "JavaScript is a popular programming language.";

// 将 "is" 替换为 "was"
const newStr = str.replaceAll("is", "was");

console.log(newStr); // 输出："JavaScript was a popular programming language."</code>

Note: The replaceAll() method only replaces fully matched substrings. For example, in the following example, a will not be replaced because cat is not an exact matching substring in the string:

<code class="js">const str = "The cat is on the mat.";

// 试图替换 "cat" 为 "dog"
const newStr = str.replaceAll("cat", "dog");

console.log(newStr); // 输出："The cat is on the mat."</code>

To replace an incomplete matching substring String, you can use regular expressions and

replace() method.

Advantages:

The replaceAll() method provides global replacement functionality without using loops or regular expressions.
• It is easy to use and easy to understand.

Disadvantages:

It may not be suitable for certain situations when substrings that do not match exactly need to be replaced.
• For longer strings, it may cause performance issues.

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