Question

How to replace a random word in a string with a random word from an array of words using TypeScript

Answer 1

function replaceRandomWord(text: string, replacementWords: string[]): string {
  const words: string[] = text.split(" ");

  if (words.length === 0 || replacementWords.length === 0) {
    return text; // nothing to do
  }

  // Pick random index in the sentence
  const idx: number = Math.floor(Math.random() * words.length);

  // Pick random replacement word
  const newWord: string = replacementWords[Math.floor(Math.random() * replacementWords.length)];

  // Replace it
  words[idx] = newWord;

  // Rebuild the string
  return words.join(" ");
}

const text = "The quick brown fox jumps over the lazy dog";
const replacementWords: string[] = ["c#", "c++", "java", "rust", "python"];

const result: string = replaceRandomWord(text, replacementWords);
console.log(result);

 
  
  
/*
run:
  
"The quick brown fox c# over the lazy dog" 
  
*/

 

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