array flatten
// flat(depth),
// depth is optional: how deep a nested array structure
// should be flattened.
// default value of depth is 1
const arr1 = [1, 2, [3, 4]];
arr1.flat();
// [1, 2, 3, 4]
const arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();
// [1, 2, 3, 4, [5, 6]]
const arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2);
// [1, 2, 3, 4, 5, 6]
const arr4 = [1, 2, [3, 4, [5, 6, [7, 8, [9, 10]]]]];
arr4.flat(Infinity);
// [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Log in, to leave a comment
4
4
// Although this now may be an older version of how to faltten an
// array of arrays. I still want to post it so some may have an understanding
// of how it works
function falltenArray(arr) {
let result = [...arr];
let flattened = false;
let counter = 0;
while (flattened === false){
// checks to see if the element at the counter index is an array
if (Array.isArray(result[counter])){
// unpacks the current array element back into the array
result.splice(counter, 1, ...result[counter]);
// if so the counter should start at the beginning of the array
counter = 0;
} else {
counter += 1;
}
if (counter === result.length){
flattened = true;
}
}
return result;
}
Thank you!
4
0
4.43
7
var arr1 = [1, 2, [3, 4]];
arr1.flat();
// [1, 2, 3, 4]
var arr2 = [1, 2, [3, 4, [5, 6]]];
arr2.flat();
// [1, 2, 3, 4, [5, 6]]
var arr3 = [1, 2, [3, 4, [5, 6]]];
arr3.flat(2);
// [1, 2, 3, 4, 5, 6]
Thank you!
7
0
4
7
var arrays = [
["$6"],
["$12"],
["$25"],
["$25"],
["$18"],
["$22"],
["$10"]
];
var merged = [].concat.apply([], arrays);
console.log(merged);
Thank you!
7
0
0
0
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);
Thank you!
0
0
4
8
const flatten = (ary) => ary.reduce((a, b) => a.concat(Array.isArray(b) ? flatten(b) : b), [])
Thank you!
8
0
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