decision_tree.json

[
  {
    "text": "I have an <strong>unsorted array</strong>",
    "nodes": [
      {
        "text": "I want <strong>one element</strong>",
        "nodes": [
          {
            "text": "Does it exist?",
            "nodes": [
              {
                "text": "I have an <strong>exact value</strong>: <a>_.includes</a>",
                "href": "https://lodash.com/docs/4.17.10#includes"
              },
              {
                "text": "I have a <strong>predicate</strong>: <a>_.some</a>",
                "href": "https://lodash.com/docs/4.17.10#some"
              }
            ]
          },
          {
            "text": "Where is it? (an index, or null)",
            "nodes": [
              {
                "text": "I have an <strong>exact value</strong>",
                "nodes": [
                  {
                    "text": "I want the <strong>leftmost</strong> occurrence: <a>_.indexOf</a>",
                    "href": "https://lodash.com/docs/4.17.10#indexOf"
                  },
                  {
                    "text": "I want the <strong>rightmost</strong> occurence: <a>_.lastIndexOf</a>",
                    "href": "https://lodash.com/docs/4.17.10#lastIndexOf"
                  }
                ]
              },
              {
                "text": "I have a <strong>predicate</strong>",
                "nodes": [
                  {
                    "text": "I want the <strong>leftmost</strong> occurrence: <a>_.findIndex</a>",
                    "href": "https://lodash.com/docs/4.17.10#findIndex"
                  },
                  {
                    "text": "I want the <strong>rightmost</strong> occurence: <a>_.findLastIndex</a>",
                    "href": "https://lodash.com/docs/4.17.10#findLastIndex"
                  }
                ]
              }
            ]
          },
          {
            "text": "What exactly is the element?",
            "nodes": [
              {
                "text": "The <strong>first</strong>: <a>_.first</a>, <a>_.head</a>",
                "href": "https://lodash.com/docs/4.17.10#first"
              },
              {
                "text": "Somewhere in the <strong>middle</strong>, by index: <a>_.nth</a>",
                "href": "https://lodash.com/docs/4.17.10#nth"
              },
              {
                "text": "The <strong>last</strong>: <a>_.last</a>",
                "href": "https://lodash.com/docs/4.17.10#last"
              },
              {
                "text": "Some <strong>random</strong> one: <a>_.sample</a>",
                "href": "https://lodash.com/docs/4.17.10#sample"
              },
              {
                "text": "I have a <strong>predicate</strong>",
                "nodes": [
                  {
                    "text": "I want the <strong>leftmost</strong> occurrence: <a>_.find</a>",
                    "href": "https://lodash.com/docs/4.17.10#find"
                  },
                  {
                    "text": "I want the <strong>rightmost</strong> occurence: <a>_.findLast</a>",
                    "href": "https://lodash.com/docs/4.17.10#findLast"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "text": "I want a <strong>subset of elements</strong>",
        "nodes": [
          {
            "text": "I know which ones I want",
            "nodes": [
              {
                "text": "A bunch of items on the <strong>left</strong>",
                "nodes": [
                  {
                    "text": "A fixed number of elements: <a>_.take</a>",
                    "href": "https://lodash.com/docs/4.17.10#take"
                  },
                  {
                    "text": "Moving to right while some condition is true: <a>_.takeWhile</a>",
                    "href": "https://lodash.com/docs/4.17.10#takeWhile"
                  }
                ]
              },
              {
                "text": "A bunch of items on the <strong>right</strong>",
                "nodes": [
                  {
                    "text": "A fixed number of elements: <a>_.takeRight</a>",
                    "href": "https://lodash.com/docs/4.17.10#takeRight"
                  },
                  {
                    "text": "Starting at the end, moving to the start while some condition is true: <a>_.takeRightWhile</a>",
                    "href": "https://lodash.com/docs/4.17.10#takeRightWhile"
                  }
                ]
              },
              {
                "text": "All but the <strong>last</strong> element: <a>_.initial</a>",
                "href": "https://lodash.com/docs/4.17.10#initial"
              },
              {
                "text": "All but the <strong>first</strong> element: <a>_.tail</a>",
                "href": "https://lodash.com/docs/4.17.10#tail"
              },
              {
                "text": "A bunch in the <strong>middle</strong>, between two indicies: <a>_.slice</a>",
                "href": "https://lodash.com/docs/4.17.10#slice"
              },
              {
                "text": "Matching elements in a given array: <a>_.intersection</a>, <a>_.intersectionBy</a>, <a>_.intersectionWith</a>",
                "href": "https://lodash.com/docs/4.17.10#intersection"
              },
              {
                "text": "Matching a <strong>predicate</strong>: <a>_.filter</a>",
                "href": "https://lodash.com/docs/4.17.10#filter"
              }
            ]
          },
          {
            "text": "I know which ones I <strong>don't</strong> want, i.e. I want to delete elements",
            "nodes": [
              {
                "text": "A bunch of items on the <strong>left</strong>",
                "nodes": [
                  {
                    "text": "A fixed number of elements: <a>_.drop</a>",
                    "href": "https://lodash.com/docs/4.17.10#drop"
                  },
                  {
                    "text": "Moving to right while some condition is true: <a>_.sropWhile</a>",
                    "href": "https://lodash.com/docs/4.17.10#dropWhile"
                  }
                ]
              },
              {
                "text": "A bunch of items on the <strong>right</strong>",
                "nodes": [
                  {
                    "text": "A fixed number of elements: <a>_.dropRight</a>",
                    "href": "https://lodash.com/docs/4.17.10#dropRight"
                  },
                  {
                    "text": "Starting at the end, moving to the start while some condition is true: <a>_.dropRightWhile</a>",
                    "href": "https://lodash.com/docs/4.17.10#dropRightWhile"
                  }
                ]
              },
              {
                "text": "All <strong>falsey</strong> values: <a>_.compact</a>",
                "href": "https://lodash.com/docs/4.17.10#compact"
              },
              {
                "text": "All <strong>duplicate</strong> values:  <a>_.uniq</a>, <a>_.uniqBy</a>, <a>_.uniqWith</a> ",
                "href": "https://lodash.com/docs/4.17.10#uniq"
              },
              {
                "text": "Some <strong>fixed</strong> values: <a>_.without</a> or <a>_.pull</a> (mutates array)",
                "href": "https://lodash.com/docs/4.17.10#without"
              },
              {
                "text": "The values at a list of particular indices: <a>_.pullAt</a> (mutates array)",
                "href": "https://lodash.com/docs/4.17.10#pullAt"
              },
              {
                "text": "Matching elements in a given array: <a>_.difference</a>, <a>_.differenceBy</a>, <a>_.differenceWith</a> OR <a>_.pullAll</a>, <a>_.pullAllBy</a>, <a>_.pullAllWith</a> (mutates array) ",
                "href": "https://lodash.com/docs/4.17.10#difference"
              },
              {
                "text": "Matching a <strong>predicate</strong>: <a>_.reject</a>, <a>_.remove</a> (mutates array)",
                "href": "https://lodash.com/docs/4.17.10#reject"
              }
            ]
          },
          {
            "text": "Let Lodash pick them for me: <a>_.sampleSize</a>",
            "href": "https://lodash.com/docs/4.17.10#sampleSize"
          }
        ]
      },
      {
        "text": "I want to <strong>loop</strong>: to do something with each element",
        "nodes": [
          {
            "text": "And change each element",
            "nodes": [
              {
                "text": "To a <strong>fixed</strong> value: <a>_.fill</a>",
                "href": "https://lodash.com/docs/4.17.10#fill"
              },
              {
                "text": "To a value returned from a <strong>function</strong>: <a>_.map</a>",
                "href": "https://lodash.com/docs/4.17.10#map"
              }
            ]
          },
          {
            "text": "And apply a procedure, leaving the element alone",
            "nodes": [
              {
                "text": "Starting from the <strong>left</strong>: <a>_.each</a>, <a>_.forEach</a>",
                "href": "https://lodash.com/docs/4.17.10#forEach"
              },
              {
                "text": "Starting from the <strong>right</strong>: <a>_.eachRight</a>, <a>_.forEachRight</a>",
                "href": "https://lodash.com/docs/4.17.10#forEachRight"
              }
            ]
          }
        ]
      },
      {
        "text": "I want to <strong>reorder<strong> the elements",
        "nodes": [
          {
            "text": "In some <strong>random</strong> order: <a>_.shuffle</a>",
            "href": "https://lodash.com/docs/4.17.10#shuffle"
          },
          {
            "text": "In <strong>sorted</strong> order: <a>_.sortBy</a>, <a>_.orderBy</a>",
            "href": "https://lodash.com/docs/4.17.10#sortBy"
          },
          {
            "text": "In <strong>reverse</strong> order: <a>_.reverse</a>",
            "href": "https://lodash.com/docs/4.17.10#reverse"
          }
        ]
      },
      {
        "text": "I want to change the shape of the array",
        "nodes": [
          {
            "text": "Removing the subarrays",
            "nodes": [
              {
                "text": "<strong>1 level</strong> deep: <a>_.flatten</a>",
                "href": "https://lodash.com/docs/4.17.10#flatten"
              },
              {
                "text": "<strong>N levels</strong> deep: <a>_.flattenDepth</a>",
                "href": "https://lodash.com/docs/4.17.10#flattenDepth"
              },
              {
                "text": "<strong>All the way down</strong> no matter how deep: <a>_.flattenDeep</a>",
                "href": "https://lodash.com/docs/4.17.10#flattenDeep"
              }
            ]
          },
          {
            "text": "Flipping the axes: <a>_.zip</a>, <a>_.unzip</a>",
            "href": "https://lodash.com/docs/4.17.10#zip"
          }
        ]
      },
      {
        "text": "I want some information about the array as a whole",
        "nodes": [
          {
            "text": "The <strong>size</strong>: <a>_.size</a>",
            "href": "https://lodash.com/docs/4.17.10#size"
          },
          {
            "text": "An <strong>aggregate</strong> (sum, maximum, or whatever function you want): <a>_.reduce</a>, <a>_reduceRight</a>",
            "href": "https://lodash.com/docs/4.17.10#reduce"
          },
          {
            "text": "Whether elements conform to a predicate",
            "nodes": [
              {
                "text": "<strong>At least one</strong> of them: <a>_.some</a>",
                "href": "https://lodash.com/docs/4.17.10#flatten"
              },
              {
                "text": "<strong>All</strong> of them: <a>_.every</a>",
                "href": "https://lodash.com/docs/4.17.10#every"
              },
              {
                "text": "<strong>How many</strong> of them: <a>_.countBy</a>",
                "href": "https://lodash.com/docs/4.17.10#countBy"
              }
            ]
          }
        ]
      },
      {
        "text": "I want to do something not listed above",
        "nodes": [
          {
            "text": "<strong>Split</strong> into equal-sized subarrays: <a>_.chunk</a>",
            "href": "https://lodash.com/docs/4.17.10#chunk"
          },
          {
            "text": "<strong>Glue</strong> a bunch of elements",
            "nodes": [
              {
                "text": "Keeping duplicates: <a>_.concat</a>",
                "href": "https://lodash.com/docs/4.17.10#concat"
              },
              {
                "text": "Removing duplicates: <a>_.union</a>, <a>_.unionBy</a>, <a>_.unionWith</a>",
                "href": "https://lodash.com/docs/4.17.10#union"
              }
            ]
          },
          {
            "text": "Create an object from a <strong>array of 2-element subarrays</strong>: <a>_.fromPairs</a>",
            "href": "https://lodash.com/docs/4.17.10#fromPairs"
          },
          {
            "text": "<strong>Join</strong> the elements into a big string: <a>_.join</a>",
            "href": "https://lodash.com/docs/4.17.10#join"
          },
          {
            "text": "<strong>Group</strong> a bunch of elements",
            "nodes": [
              {
                "text": "Into two arrays according to a boolean predicate: <a>_.partition</a>",
                "href": "https://lodash.com/docs/4.17.10#partition"
              },
              {
                "text": "Into an object whose properties are computed by a function: Removing duplicates: <a>_.groupBy</a>",
                "href": "https://lodash.com/docs/4.17.10#groupBy"
              }
            ]
          }
        ]
      }
    ]
  },
  {
    "text": "I have a <strong>sorted array</strong>",
    "nodes": [
        {
          "text": "I want to know where an element can be inserted to preserve order",
          "nodes": [
            {
              "text": "The <strong>leftmost</strong> index: <a>_.sortedIndex</a>, <a>_.sortedIndexBy</a>, <a>_.sortedIndexOf</a>",
              "href": "https://lodash.com/docs/4.17.10#sortedIndex"
            },
            {
              "text": "The <strong>rightmost</strong> index: <a>_.sortedLastIndex</a>, <a>_.sortedLastIndexBy</a>, <a>_.sortedLastIndexOf</a>",
              "href": "https://lodash.com/docs/4.17.10#sortedLastIndex"
            }
          ]
        },
        {
          "text": "I want all unique elements in sorted order: <a>_.sortedUniq</a>, <a>_.sortedUniqBy</a>",
          "href": "https://lodash.com/docs/4.17.10#sortedUniq"
        },
        {
          "text": "For everything else, see Unsorted Array above",
          "href": "index.html"
        }
      ]
  },
  {
    "text": "I have an <strong>object</strong>"
  }
]