Reference operator (unary): passing a variable by reference instead of by value. 
     
    
     
     Index operator (binary): accesses a specific element of an array, string, numeric or object. 
     
    
     
     Literal array: encloses values for literal arrays. 
     
    
     
     Delimiting characters for literal code blocks. 
     
    
     
     Plus operator (unary): defines the sign of numeric values. 
     
    
     
     Increment operators (unary): increase numeric or date value by one. 
     
    
     
     Less than operator (binary): size comparison of two values. 
     
    
     
     Less than or equal to operator (binary): size comparison of two values.