We are required to write a JavaScript array function that takes in a nested array with falsy values and returns an array with all the elements present in the array without any nesting.
For example − If the input is −
const arr = [[1, 2, 3], [4, 5, [5, false, 6, [5, 8, null]]], [6]];
Then the output should be −
const output = [1, 2, 3, 4, 5, false, 6, 5, 8, null, 6];
Example
Following is the code −
const arr = [[1, 2, 3], [4, 5, [5, false, 6, [5, 8, null]]], [6]];
const flatten = function(){
let res = [];
for(let i = 0; i < this.length; i++){
if(Array.isArray(this[i])){
res.push(...this[i].flatten());
}else{
res.push(this[i]);
};
};
return res;
};
Array.prototype.flatten = flatten;
console.log(arr.flatten());Output
This will produce the following output in console −
[ 1, 2, 3, 4, 5, 5, false, 6, 5, 8, null, 6 ]