Question

How to remove the last word from a string in TypeScript

Answer 1

function removeLastWord(s: string) {
    const indexOfLastSpace = s.lastIndexOf(' ');
 
    if (indexOfLastSpace === -1) {
        return s;
    }
 
    return s.substring(0, indexOfLastSpace);
}
 
 
let str: string = "javascript php c++ typescript node.js";
 
str = removeLastWord(str);
  
console.log(str);
      
       
       
/*
run:
       
javascript php c++ typescript
       
*/

 

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Answer 2

function removeLastWord(s: string): string {
  // Trim trailing spaces
  s = s.trimEnd();

  const indexOfLastSpace: number = s.lastIndexOf(" ");

  if (indexOfLastSpace === -1) {
    return s; // no space → return original
  }

  return s.substring(0, indexOfLastSpace);
}

let s: string;

s = "c c++ c# java python";
s = removeLastWord(s);
console.log("1. " + s);

s = "";
s = removeLastWord(s);
console.log("2. " + s);

s = "c";
s = removeLastWord(s);
console.log("3. " + s);

s = "c# java python ";
s = removeLastWord(s);
console.log("4. " + s);

s = "  ";
s = removeLastWord(s);
console.log("5. " + s);
      
       
       
/*
run:
       
1. c c++ c# java
2. 
3. c
4. c# java
5. 
       
*/

 

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