let arr = [
[1, 2],
[3, 4],
[5, 6][7, 8, 9],
[10, 11, 12, 13, 14, 15]
];
let flatArray = arr.reduce((acc, curVal) => {
return acc.concat(curVal)
}, []);
//Output: [ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ]const arr = [1, 2, [3, 4]];
// To flat single level array
arr.flat();
// is equivalent to
arr.reduce((acc, val) => acc.concat(val), []);
// [1, 2, 3, 4]
// or with decomposition syntax
const flattened = arr => [].concat(...arr);
const arr = [1, 2, [3, 4, [5, 6]]];
// to enable deep level flatten use recursion with reduce and concat
function flatDeep(arr, d = 1) {
return d > 0 ? arr.reduce((acc, val) => acc.concat(Array.isArray(val) ? flatDeep(val, d - 1) : val), [])
: arr.slice();
};
flatDeep(arr, Infinity);
// [1, 2, 3, 4, 5, 6]
// Faltten an array
const age=[1,2,
[12,23,[75,34,[2,34]],[32,45]],
[3,456],
[56,5]]
// to store resultant array
let result=[]
function flattenArray(inputArray)
{
inputArray.map((value)=>{
if(Array.isArray(value))
{
flattenArray(value)
}
else{
result.push(value)
}})
}
// calling function to fallten an array
flattenArray(age);