Iterate between two numbers with object.keys [duplicate]

Question

I've got the a list of objects iterating in object.keys, however how can I iterate between two numbers only(3-5)? And ignoring the rest of the list.

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 listItem = Object.keys(obj).map((key) => <div key={key}> <div>{key}</div> <div> {obj[key].map(el => {el.title} )} </div> </div> )

Use slice? developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — evolutionxbox
– evolutionxbox, Commented Jan 22, 2021 at 10:46

malarres · Accepted Answer · 2021-01-22 10:58:02Z

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)

please notice that an array index starts at 0, modify start and end at your will

This is horrendous. There is no reason to use filter while slice is available.
wow kind of a harsh adjective. i'm not saying that this solution is better, but at least it looks like there's room for discussion: medium.com/@justintulk/…
Well if this was your reason to choose to "reinvent the wheel", then I would reflect that in your answer. Currently it is overcomplicating things without giving any reason.

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