Steamroller

steamroller.js

function steamroller(arr) {
  var outputArr = [];
  var needsFlatten = false;
  for (var z=0;z<arr.length;z++){
    /* remove objects - optional, remove comment if object removal is needed
    if (typeof arr[z] === 'object' && !isArray(arr[z])){
      arr.splice(z,1);
    }
    */
    while (isArray(arr[z])){
      arr = flatten(arr);
    }
  }
  function flatten(arr){
    var firstPrt = [];
    var secondPrt = [];
    for (var i=0;i<arr.length;i++){
      var curVal = arr[i];
      var isIt = isArray(curVal);
      if (isIt && curVal !== ""){
        firstPrt = arr.slice(0,i);
        secondPrt = arr.slice(i+1,arr.length);
        arr = [];
        arr = arr.concat(firstPrt);
        for (var j=0;j<curVal.length;j++){
          arr = arr.concat(curVal[j]);
        }
        arr = arr.concat(secondPrt);
      }
    }
    return arr;
  }
  function isArray(inputArr) {
    return inputArr.constructor.toString().indexOf("Array") > -1;
  }
  return arr;
}
steamroller([1, {}, [3, [[4]]]]);

Steamroller.markdown

Steamroller

Flattens a nested array with account for varying levels of nesting.

A script by V.

License.