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React - render first N elements from array

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Dirask JS Member
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In this article, we would like to show you how to render the first N elements from the array in React.

To get the first N number of elements from an array we can use the slice(),  then we convert the array items to React elements with map() method.

Quick solution:

  // some code here
  let n = 3;   // number of n first elements to render 
  let newArray = array.slice(0, n).map(i => {
    return <element key={i.id} />
  }
  return (
    <div>
      {newArray}
    </div>
  )
}

Note:

Remember that each element should have a unique key - it helps React optimally manage changes in the DOM. Such a key may be, for example, the id assigned to each element.

Practical example:

// ONLINE-RUNNER:browser;

// Note: Uncomment import lines during working with JSX Compiler.
// import React from "react";
// import ReactDOM from "react-dom";

const App = () => {
  const buttons = [
    { id: 1, text: "Button 1" },
    { id: 2, text: "Button 2" },
    { id: 3, text: "Button 3" },
    { id: 4, text: "Button 4" },
    { id: 5, text: "Button 5" }
  ];

  // try to change n number
  const n = 2;
  const firstNElements = buttons.slice(0, n).map(({ id, text }) => {
    return (<button key={id}>{text}</button>)
  });

  return (
  <div>
    <p>First {n} elements from array</p>
    {firstNElements}
  </div>
  );
};

const root = document.querySelector('#root');
ReactDOM.render(<App />, root);

ReactJS

React - render first N elements from array
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