Nodejs Array Find findRanges()

Method Source Code

/*//from w ww.  j a  va 2 s .  com
  Array.findRanges
  
  Turns this:
  
  ["a","a","a","b","b","c","c","c","c","c","a","a","c"]
  
  into this:
  
  {
    "a":[
      {
        "from":0,
        "to":2
      },
      {
        "from":10,
        "to":11
      }
    ],
    "b":[
      {
        "from":3,
        "to":4
      }
    ],
    "c":[
      {
        "from":5,
        "to":9
      },
      {
        "from":12,
        "to":12
      }
    ]
  }

*/

Array.prototype.findRanges = function() {
  var buckets = {};
  for(var i = 0; i < this.length; i++) {
    if(!(this[i] in buckets)) {
      buckets[this[i]] = [{
        from: i,
        to: i
      }]
    } else {
      var last = buckets[this[i]][ buckets[this[i]].length-1 ];
      if(i == last.to + 1) {
        last.to = i;
      } else {
        buckets[this[i]].push({
          from: i,
          to: i
        })
      }
    }
  }
  return buckets;
};
Array.prototype.clean = function(deleteValue) {
  for (var i = 0; i < this.length; i++) {
    if (this[i] == deleteValue) {         
      this.splice(i, 1);
      i--;
    }
  }
  return this;
};
Object.values = function(obj){ return Object.keys(obj).map(function(key){return obj[key]}) };

Related

1. findHighestNumber(inField)

   Array.prototype.findHighestNumber = function(inField)
     var tmp = [];
     for (var i = 0; i < this.length; i++) {
       tmp[i] = Number(this[i][inField]);
     if(this.length < 1)
       return 0;
     return Math.max.apply(Math, tmp);
   ...
   

2. findIdx(fn)

   Array.prototype.findIdx = function(fn) {
       return this.indexOf(this.filter(val => fn(val))[0]);
   };
   

3. findIfNotError(filter)

   Array.prototype.findIfNotError = function(filter) {
       var result = this.find(filter);
       if ( !result ) {
           throw new Error();
       return result;
   

4. findInJson(attr, value)

   Array.prototype.findInJson = function (attr, value){
     for(var i=0; i<this.length; i++){
       this[i][attr] = this[i][attr].toLowerCase();
       if(this[i][attr] == value){
         return true;
       };
     };
     return false;
   };
   ...
   

5. findMaximumfindIt()

   var array = [47, 98, 0, -23, 4, 87.3, 0.0003, +9];
   Array.prototype.findMaximum = function findIt() {
   var arrayValue = 0;
   for(var i = 0; i < array.length; i++) {
     if (array[i] > arrayValue) {
       arrayValue = array[i];
     return arrayValue;
   ...
   

6. findThing(n)

   Array.prototype.findThing = function(n){
     for(var i=0; i<this.length; i++){
       if(this[i] === n){
         return true;
       };
     };
     return false;
   };
   

7. findYoungestPersonfindYoungestPerson()

   Array.prototype.findYoungestPerson = function findYoungestPerson() {
           var youngest = this[0];
       for (var person = 1; person < this.length; person += 1) {
           if (this[person].age < youngest.age) {
               youngest = this[person];
       return youngest;
   };
   ...
   

8. find_by(prop, val)

   Array.prototype.find_by = function(prop, val) {
     return this.filter(function(obj) {
       return obj[prop] === val
     }).first()