How to use the substring method in React

Use in Reactsubstring()method:

• Call this method on a string.
• Pass the start and end index as parameters to it.
• This method returns a new string that contains only the specified part of the original string.

const App = () => {
  const str = 'Walk the dog';
  const result = (0, 4);
  (result); // ?️ "Walk"
  return (
    <div>
      <h2>{result}</h2>
    </div>
  );
};
export default App;

We pass it toThe two parameters of the method are:

• startIndex – The index of the first character to be included in the return string
• endIndex – ends to end, but does not include this index

JavaScriptThe index in  starts from zero, which means that the first index in the string is0, the last index is - 1。

We can also use it directly in JSX codesubstringmethod.

const App = () => {
  const str = 'Walk the dog';
  return (
    <div>
      <h2>{(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 = (5);
  (result); // ?️ "the dog"
  return (
    <div>
      <h2>{result}</h2>
    </div>
  );
};
export default App;

We index5The characters are extracted at the beginning, until the end of the original string.

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