JSON array splitting React JS

Question

I have a JSON array in my state and I want to use the other half of it. For example if the size of the JSON array is 10, I am interested in to access the later 5 values. How can I achieve that? I have tried many solutions but I always end up getting errors. I am working with React JS. So I was using map function but I am unable to fulfill my condition.

  data.map((item, index) => {

I am unable to use reduce or filter I tried that also.

did you try to use slice method? you can read about it here: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — Saeed Shamloo
– Saeed Shamloo, Commented Dec 22, 2021 at 18:17

jmk · Accepted Answer · 2021-12-22 18:21:39Z

2

As @SaeedShamloo mentioned slice method will be sufficient here

data.slice(Math.floor(data.length/2), data.length).map(item => )

answered Dec 22, 2021 at 18:21

jmk

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2 Comments

Paladin Over a year ago

data.form.slice(Math.floor(0), data.form.length/2).map((item, index) => { }) Is this the right thing to do if I want to access the first half?

jmk Over a year ago

The op question was For example if the size of the JSON array is 10, I am interested in to access the later 5 values

Siva Kondapi Venkata · Accepted Answer · 2021-12-22 20:13:32Z

1

Use filter by array indexes.

const data = [6, 7, 8, 9, 10, 11, 12, 13, 14, 15];

const res = data.filter((_, idx, arr) => idx >= arr.length / 2);

console.log(res);


// Alternatively
const res2 = data.slice(-data.length/2);

console.log(res2);

answered Dec 22, 2021 at 20:13

Siva Kondapi Venkata

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