I have this array
[[11,12,13,14],[21,22,23,24],[31,32,33,34],[41],[43],[51]]
,
expected output like this: 11-14,21-24,31-34,41,43,51
3 Answers
We can do it via Array.map()
const data = [[11,12,13,14],[21,22,23,24],[31,32,33,34],[41],[43],[51]]
let result = data.map(d => {
if(d.length < 2){
return d[0]
}
return d.at(0) +' -' + d.at(-1)
})
console.log(result)
Comments
[[11,12,13,14],[21,22,23,24],[31,32,33,34],[41],[43],[51]].map((arr) => {
if(arr.length > 1){
return `${arr[0]}-${arr[arr.length-1]}`
}
return `${arr[0]}`;
})
['11-14', '21-24', '31-34', '41', '43', '51']
Comments
You can use Array.prototype.reduce():
const data = [[11,12,13,14],[21,22,23,24],[31,32,33,34],[41],[43],[51]]
const result = data.reduce(
(a, arr) => [...a, arr.length >= 2 ? `${arr[0]}-${arr[arr.length - 1]}` : arr[0]],
[]
)
console.log(result)
array[0]. Otherwise, concatenate the first and last elements with-between them.