JavaScript - remove substring from string between indexes

In this article, we are going to look at how to remove substring from a string using JavaScript.

Note: in practice when we want to remove some characters from existing string, we need to create new string, what was shown in the below example.

Practical example:

// ONLINE-RUNNER:browser;

function removeSubstring(text, startIndex, endIndex) {
  	if (endIndex < startIndex) {
  		startIndex = endIndex;
    }
    var a = text.substring(0, startIndex);
    var b = text.substring(endIndex);
    return a + b;
}


// Usage example:

//   index: 0    5 7   11 14
//          |    | |   |  |
var text = "This is my text";

console.log( removeSubstring(text, 0, 1) );               // is my text
console.log( removeSubstring(text, 5, 7) );               // This  my text
console.log( removeSubstring(text, 1, text.length - 1) ); // Tt

Output:

his is my text
This  my text
Tt