Question

How to convert part of a string between two indexes to lowercase in Node.js

Answer 1

function convert_part_to_lowercase(str, start, end) {
    // Extract the part of the string before the start index
    const before = str.substring(0, start);
     
    const upperPart = str.substring(start, end).toLowerCase();
     
    // Extract the part of the string after the end index
    const after = str.substring(end);
     
    return before + upperPart + after;
}
         
     
let s = "NODE.JS PROGRAMMING";
   
s = convert_part_to_lowercase(s, 3, 6);
console.log(s); 
  
s = convert_part_to_lowercase(s, 13, 14);
console.log(s); 
 
 
 
/*
run:
      
NODe.jS PROGRAMMING
NODe.jS PROGRaMMING
      
*/

 

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