Using JavaScript, swap out all occurrences of the symbol "*" with elements found in an array

Question

Using JavaScript, swap out all occurrences of the symbol "*" with elements found in an array

To tackle this problem, I need to create an empty array and then add characters from the provided sentence into it, excluding asterisks. This approach will help me when I eventually need to iterate through the array items for replacements.

function replaceAsterisk(sentence, newWords) {

  let newArray = [];

  let character = sentence.split("");

  console.log(character);

  // If the character is not an asterisk, push it into the new array
  if (character !== "*") {
    newArray.push(character);
  }

  // If the character is an asterisk, push "cat" into the new array
  else {
    newArray.push("cat");
  }
  
  // Return the new array as a string
  return newArray.join(" ");
}

console.log(replaceAsterisk("My name is * and I am a *.", ["Sabrina", "Black Cat", "extra", "words"]));

Despite these instructions, the code still isn't adding "cat" to the array - what could be causing this issue?

javascript arrays string function ecmascript-6

Answer 1

Answer №1

Utilize the String.replace() method along with a function that dynamically generates replacement strings. Inside the function, retrieve the current replacement from the array newWords by using a counter:

function replaceAsterisk(sentence, newWords) {
  let counter = 0;
  
  return sentence.replace(/\*/g, () => newWords[counter++] || '');
}

console.log(replaceAsterisk("My name is * and I am a *.", ["Sabrina", "Black Cat", "extra", "words"]));

Answer 2

Utilize the String.replace() method along with a function that dynamically generates replacement strings. Inside the function, retrieve the current replacement from the array newWords by using a counter:

function replaceAsterisk(sentence, newWords) {
  let counter = 0;
  
  return sentence.replace(/\*/g, () => newWords[counter++] || '');
}

console.log(replaceAsterisk("My name is * and I am a *.", ["Sabrina", "Black Cat", "extra", "words"]));

Answer 3

Answer №2

To start, you must iterate through each individual character before proceeding further. Here is a simple example to illustrate the process:

function replaceAsterisk(sentence, newWords) {

    let newArray = [];

    let characters = sentence.split("");

    console.log(characters);
    
    characters.forEach(function(character){
      // If the character is not an asterisk, add it to the new array
      if (character !== "*") {
        newArray.push(character);
      }

      // If the character is an asterisk, add "cat" to the new array
      else {
        newArray.push("cat");
      }
    });
    // Convert the new array into a string and return it
    return newArray.join("");
}

console.log(replaceAsterisk("My name is * and I am a *.", ["Sabrina", "Black Cat", "extra", "words"]));

Answer 4

To start, you must iterate through each individual character before proceeding further. Here is a simple example to illustrate the process:

function replaceAsterisk(sentence, newWords) {

    let newArray = [];

    let characters = sentence.split("");

    console.log(characters);
    
    characters.forEach(function(character){
      // If the character is not an asterisk, add it to the new array
      if (character !== "*") {
        newArray.push(character);
      }

      // If the character is an asterisk, add "cat" to the new array
      else {
        newArray.push("cat");
      }
    });
    // Convert the new array into a string and return it
    return newArray.join("");
}

console.log(replaceAsterisk("My name is * and I am a *.", ["Sabrina", "Black Cat", "extra", "words"]));

Answer 5

Answer №3

To solve this problem, you should iterate through each character in the given sentence:

function replaceAsterisk(sentence, newWords) {
  let newArray = [];

  for( let i = 0; i < sentence.length; i++) { // Ensure all characters are processed
    character = sentence[i];
    // Check if the character is not an asterisk and add it to the new array
    if (character !== "*") {
      newArray.push(character);
    }
  
    // If the character is an asterisk, replace it with "cat" in the new array
    else {
      newArray.push("cat");
    }
  }
  // Convert the new array into a string and return
  return newArray.join(" ");
}

console.log(replaceAsterisk("My name is * and I am a *.", ["Sabrina", "Black Cat", "extra", "words"]));

Answer 6

To solve this problem, you should iterate through each character in the given sentence:

function replaceAsterisk(sentence, newWords) {
  let newArray = [];

  for( let i = 0; i < sentence.length; i++) { // Ensure all characters are processed
    character = sentence[i];
    // Check if the character is not an asterisk and add it to the new array
    if (character !== "*") {
      newArray.push(character);
    }
  
    // If the character is an asterisk, replace it with "cat" in the new array
    else {
      newArray.push("cat");
    }
  }
  // Convert the new array into a string and return
  return newArray.join(" ");
}

console.log(replaceAsterisk("My name is * and I am a *.", ["Sabrina", "Black Cat", "extra", "words"]));

Answer 7

Answer №4

This solution is effective. It's important to note that splitting on empty strings can behave unexpectedly (refer to MDN...split)

  let newArray = [], sentence = "My name is * and I am a *.";      
  for (let char of sentence){ newArray.push(char); }
  for(let i = 0; i < newArray.length; i++){
    if(newArray[i] == "*"){ newArray[i] = "cat"; }
  }
  console.log(newArray);

Answer 8

This solution is effective. It's important to note that splitting on empty strings can behave unexpectedly (refer to MDN...split)

  let newArray = [], sentence = "My name is * and I am a *.";      
  for (let char of sentence){ newArray.push(char); }
  for(let i = 0; i < newArray.length; i++){
    if(newArray[i] == "*"){ newArray[i] = "cat"; }
  }
  console.log(newArray);

Answer 9

Answer №5

utilizing regex group match alongside Array.prototype.shift

updateText = (sentence, replacements) => {
  const _replacements = replacements.slice();
  return sentence.replace(/(\*)/g, (match) => _replacements.shift() || match);
}

// incorporating valid replacements
const updatedSentence1 = updateText("My favorite color is * and I love *.", ["blue", "pizza", "random", "words"]);
console.log(updatedSentence1);

// providing empty replacements
const updatedSentence2 = updateText("My favorite color is * and I love *.", []);
console.log(updatedSentence2);

Answer 10

utilizing regex group match alongside Array.prototype.shift

updateText = (sentence, replacements) => {
  const _replacements = replacements.slice();
  return sentence.replace(/(\*)/g, (match) => _replacements.shift() || match);
}

// incorporating valid replacements
const updatedSentence1 = updateText("My favorite color is * and I love *.", ["blue", "pizza", "random", "words"]);
console.log(updatedSentence1);

// providing empty replacements
const updatedSentence2 = updateText("My favorite color is * and I love *.", []);
console.log(updatedSentence2);

Answer 11

Answer №6

To accomplish this task, you should iterate through each character in the given sentence and determine the word to substitute with by utilizing the shift method:

function swapPlaceholders(sentence, newWords) {
  let newSentence = "";
  [...sentence].forEach(character => {
    if (character !== "*") {
      newSentence += character;
    } else {
      newSentence += newWords.shift();
    }
  });
  return newSentence;
}

console.log(swapPlaceholders("I have a * and a *.", ["dog", "cat", "parrot"]));

Answer 12

To accomplish this task, you should iterate through each character in the given sentence and determine the word to substitute with by utilizing the shift method:

function swapPlaceholders(sentence, newWords) {
  let newSentence = "";
  [...sentence].forEach(character => {
    if (character !== "*") {
      newSentence += character;
    } else {
      newSentence += newWords.shift();
    }
  });
  return newSentence;
}

console.log(swapPlaceholders("I have a * and a *.", ["dog", "cat", "parrot"]));

Using JavaScript, swap out all occurrences of the symbol "*" with elements found in an array

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

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