Steamroller: Intermediate Algorithm Scripting Free Code Camp

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[davidmclean]

Brilliant series Dylan. Thank you very much for going through this. I am currently working through project odin (full stack dev course) and also doing the freecodecamp javascript and data structures certification. I am really still getting to grips with concepts like recursion and this made things much clearer for me.Thanks to this series I am a step closer to understanding algorithms .

[tomb]

I suck at recursion, but your answer looks beautiful to me lol.

[JamesThomas-nrog]

function steamrollArray(arr) {

while (arr.some(Array.isArray)) {

for (let i = 0; i < arr.length; i++) {

if (Array.isArray(arr[i])) {

for (let j = arr[i].length - 1; j >= 0; j--) {

arr.splice(i + 1, 0, arr[i][j])

}

arr.splice(i, 1);

break;

}

}

}

return arr;

}

// So convoluted but it works

[iWouldWantSky]

oh god thanks, i thought i was going crazy when my recursion solution wouldn't work.

[LuisForra]

You can use your first solution with IIFE and Closure:

function steamrollArray(arr) {
var newArr = [];

(function removeArray(arr) {
for (var i = 0; i < arr.length; i++) {
if (!Array.isArray(arr[i])) {
newArr.push(arr[i]);
} else {
removeArray(arr[i]);
}
}
})(arr);

return newArr;
}

[KatKaut]

Here's what I went with: return [].concat.apply([], [].concat.apply([], [].concat.apply([], arr) ) ) ;

[mekanarazmedov]

Sorry, can someone explain why we use arr2 and what is it?

[sebastianhewelt]

Did you get to know why your first solution didn't pass ? You said it passed eariler, and it looks the same as the wanted outcome. Hmmm.... (?)