How to Insert a String at a Specific Index in JavaScript?

String Insertion at a Specific Index

How do you insert a string at a particular position within another string? Let's create an example:

var txt1 = "foo baz"

Suppose we need to insert "bar" directly after "foo."

Exploring Potential Solutions:

One might consider using the substring() function. However, there must be a simpler approach.

Solution Using String Slicing:

Inserting at a specific index requires using string slicing or substring:

var txt2 = txt1.slice(0, 3) + "bar" + txt1.slice(3);

Here, we split the original string txt1 into three parts:

1. The first part (index 0 to 2) is "foo", before the insertion point.
2. The second part is the string we want to insert ("bar").
3. The third part (index 3 onwards) is the remaining part of the original string after the insertion point.

By concatenating these three parts, we get the modified string txt2 with "bar" inserted after "foo."

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