javascript - Iterate between two numbers with object.keys

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65843661/iterate-between-two-numbers-with-object-keys

Answer 1

Filter can get you there also:

const obj = { 
    '#1 List title': [{
        title: 'First',
      },
    ],
    '#2 List title': [{
        title: 'Sec', 
      },
    ], 
    '#3 List title': [{
        title: 'Third',
      },
    ], 
    '#4 List title': [{
        title: 'Fourth',
      },
    ],    
    '#5 List title': [{
        title: 'Fifth',
      },
    ],    
  };
  
  const start = 2;
  const end = 4;

const listItem =  Object.keys(obj).filter((_,i) => i >=start && i <=end).map((key) => `
    <div key=${key}>
      <div>${key}</div>
      <div>
        ${obj[key].map(el =>
          {el.title}
        )}
      </div>
    </div>
    `
  )
  
  console.log(listItem)