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using substring() method in react

author：jiyik last updated：2025/03/11 views：

using the method in react substring():

call the method on the string.
pass the start and end index as parameters to it.
this method returns a new string containing only the specified portion of the original string.

const app = () => {
  const str = 'walk the dog';

  const result = str.substring(0, 4);
  console.log(result); // 👉️ "walk"

  return (
    <div><h2>{result}h2>div>
  );
};

export default app;

the two parameters we pass to string.substringthe method are:

start index - the index of the first character to be included in the returned string
end index - up to but not including end index

javascriptthe indexes in are zero-based, which means the first index in the string is 0 and the last index is str.length - 1.

we can also use the method directly in jsx code substring.

const app = () => {
  const str = 'walk the dog';

  return (
    <div><h2>{str.substring(0, 4)}h2>div>
  );
};

export default app;

if we pass only the starting index to the method, it will return a new string containing the remaining characters.

const app = () => {
  const str = 'walk the dog';

  const result = str.substring(5);
  console.log(result); // 👉️ "the dog"

  return (
    
      {result}

    

  );
};

export default app;

we start extracting characters from index 5 and continue till the end of the original string.

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using substring() method in react-ag捕鱼王app官网