Function createArrayContains

lib/web/polyfill.js:269–280

(isContains)

  }
}
function createArrayContains(isContains){
  return function(el /*, fromIndex = 0 */){
    var O      = toObject(this)
      , length = toLength(O.length)
      , index  = toIndex(arguments[1], length);
    if(isContains && el != el){
      for(;length > index; index++)if(sameNaN(O[index]))return isContains || index;
    } else for(;length > index; index++)if(isContains || index in O){
      if(O[index] === el)return isContains || index;
    } return !isContains && -1;
  }
}
function generic(A, B){
  // strange IE quirks mode bug -> use typeof vs isFunction
  return typeof A == 'function' ? A : B;