src/basis.js
function(searchElement, offset){
      offset = parseInt(offset, 10) || 0;
      if (offset < 0)
        return -1;
      for (; offset < this.length; offset++)
        if (this[offset] === searchElement)
          return offset;
      return -1;
    }
function(searchElement, offset){
      offset = parseInt(offset, 10) || 0;
      if (offset < 0)
        return -1;
      for (; offset < this.length; offset++)
        if (this[offset] === searchElement)
          return offset;
      return -1;
    }
function ( searchElement , offset ) { offset = parseInt ( offset , 10 ) || 0 ; if ( offset < 0 ) return - 1 ; for ( ; offset < this . length ; offset ++ ) if ( this [ offset ] === searchElement ) return offset ; return - 1 ; }
JavaScript 1.6
JavaScript 1 . 6