Column IN ('a', 'b', 'c')

if (expression1 || expression2 || str === 'a' || str === 'b' || str === 'c') {
   // do something
}

if (expression1 || expression2 || {a:1, b:1, c:1}[str]) {
   // do something
}

var str = 'a',
   flag = false;

switch (str) {
   case 'a':
   case 'b':
   case 'c':
      flag = true;
   default:
}

if (expression1 || expression2 || flag) {
   // do something
}

if (!Array.prototype.indexOf) {
   Array.prototype.indexOf = function(item) {
      var i = this.length;
      while (i--) {
         if (this[i] === item) return i;
      }
   }
   return -1;
}

if (['a', 'b', 'c'].indexOf(str) >= 0) {
    //do something
}

if (/Foo|Bar|Baz/.test(str)) {
  // ...
}


if (str.match("Foo|Bar|Baz")) {
  // ...
}

if (!Array.prototype.indexOf) {
   Array.prototype.indexOf = function(item) {
      var i = this.length;
      while (i--) {
         if (this[i] === item) return i;
      }
      return -1;
   }
}

>>> ("something" in {"a string":"", "somthing":"", "another string":""})
false
>>> ("something" in {"a string":"", "something":"", "another string":""})
true

>>> a = ["a string", "something", "another string"];
>>> b = {};
>>> for(var i=0; i<a.length;i++){b[a[i]]="";} /* Transform the array in a dict */
>>> ("something" in b)
true

js> a = ['foo', 'bar', 'baz']
foo,bar,baz
js> a.indexOf('bar')
1
js> a.indexOf('quux')
-1

function inList(psString, psList)
{
    var laList = psList.split(',');

    var i = laList.length;
    while (i--) {
        if (laList[i] === psString) return true;
    }
    return false;
}

if (inList('Houston', 'LA,New York,Houston') {
  // THEN do something when your string is in the list
}

String.prototype.inList=function(list){
 return ( Array.apply(null, arguments).indexOf(this.toString()) != -1)
}

var x = 'abc';
if (x.inList('aaa','bbb','abc') )
  console.log('yes');
else
  console.log('no');

String.prototype.inList=function(list){
   return ( list.indexOf(this.toString()) != -1)
}

var x = 'abc';
if (x.inList(['aaa','bbb','abc']) )
   console.log('yes')

var list = ['a', 'b', 'c'];
if (list.include(str)) {
  // do stuff
}

function in_list(needle, hay)
{
    var i, len;

    for (i = 0, len = hay.length; i < len; i++)
    {
        if (hay[i] == needle) { return true; }
    }

    return false;
}

var alist = ["test"];

console.log(in_list("test", alist));

if ('abcdefghij'.indexOf(str) >= 0) {
    //do something
}

// checking to see if var 'column' is in array ['a', 'b', 'c']

if (column.isAmong(['a', 'b', 'c']) {
  // do something
}

Object.prototype.isAmong = function (MyArray){
   for (var a=0; a<MyArray.length; a++) {
      if (this === MyArray[a]) { return true;}
   }
   return false;
}

var str  = 'some string with a',
    list = ['a', 'b', 'c'],
    rx   = new RegExp(list.join('|'));

rx.test(str);

new RegExp(list.join('|')).text(str);

var rx = new RegExp(list.join('|').concat('/i'));