nl_tokens: * @method add ( <el > [ index ] ) @returns Array @short Adds <el > to the array . @extra If [ index ] is specified it will add at [ index ] otherwise adds to the end of the array . %add% behaves like %concat% in that if <el > is an array it will be joined not inserted . This method will change the array! Use %include% for a non - destructive alias . Also %insert% is provided as an alias that reads better when using an index . @example
pl_tokens: function ( el , index ) { if ( ! isNumber ( number ( index ) ) || isNaN ( index ) ) index = this . length ; array . prototype . splice . apply ( this , [ index , 0 ] . concat ( <mask> ) ) ; return this ; }