JavaScript: Remove the first occurrence of a given 'search string' from a string

JavaScript String: Exercise-26 with Solution

Remove First Occurrence

Write a JavaScript function to remove the first occurrence of a given 'search string' from a string.

Test Data:
console.log(remove_first_occurrence("The quick brown fox jumps over the lazy dog", 'the'));
Output:
"The quick brown fox jumps over lazy dog"

Visual Presentation:

Sample Solution:

JavaScript Code:

// Define a function called remove_first_occurrence which takes two parameters: str (the main string) and searchstr (the substring to be removed)
function remove_first_occurrence(str, searchstr) {
    // Find the index of the first occurrence of searchstr within str
    var index = str.indexOf(searchstr);
    // If searchstr is not found in str, return str as it is
    if (index === -1) {
        return str;
    }
    // If searchstr is found in str, return a new string that concatenates the substring before the first occurrence of searchstr with the substring after searchstr
    return str.slice(0, index) + str.slice(index + searchstr.length);
}

// Call the remove_first_occurrence function with a sample input and log the result to the console
console.log(remove_first_occurrence("The quick brown fox jumps over the lazy dog", 'the'));

Output:

The quick brown fox jumps over  lazy dog

Explanation:

The above JavaScript code defines a function called "remove_first_occurrence()" that takes two parameters: 'str' (the main string) and 'searchstr' (the substring to be removed).

• The function finds the index of the first occurrence of 'searchstr' within 'str'.
• If 'searchstr' is not found in 'str', the function returns 'str' as it is.
• If 'searchstr' is found in 'str', the function returns a new string that concatenates the substring before the first occurrence of 'searchstr' with the substring after 'searchstr'.

Flowchart:

Live Demo:

See the Pen Remove the first occurrence of a given 'search string' from a string - string-ex-26 by w3resource (@w3resource) on CodePen.

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