subratgoogle / javascript-operators

Javascript Operators

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Arithmetic Operators

An arithmetic operator is a mathematical function that takes two operands and performs a calculation on them. They are used in common arithmetic and most computer languages contain a set of such operators that can be used within equations to perform a number of types of sequential calculation

Exampe:

 <script type = "text/javascript">
        var a = 33;
        var b = 10;
        var c = "Test";
        var linebreak = "<br />";
     
        document.write("a + b = ");
        result = a + b;
        document.write(result);
        document.write(linebreak);
     
        document.write("a - b = ");
        result = a - b;
        document.write(result);
        document.write(linebreak);
     
        document.write("a / b = ");
        result = a / b;
        document.write(result);
        document.write(linebreak);
     
        document.write("a % b = ");
        result = a % b;
        document.write(result);
        document.write(linebreak);
     
        document.write("a + b + c = ");
        result = a + b + c;
        document.write(result);
        document.write(linebreak);
     
        a = ++a;
        document.write("++a = ");
        result = ++a;
        document.write(result);
        document.write(linebreak);
     
        b = --b;
        document.write("--b = ");
        result = --b;
        document.write(result);
        document.write(linebreak);
  </script>

Comparison Operators

JavaScript has both strict and type–converting comparisons. A strict comparison (e.g., ===) is only true if the operands are of the same type and the contents match. The more commonly-used abstract comparison (e.g. ==) converts the operands to the same type before making the comparison. For relational abstract comparisons (e.g., <=), the operands are first converted to primitives, then to the same type, before comparison.

Example:

  <script type = "text/javascript">
     
        var a = 10;
        var b = 20;
        var linebreak = "<br />";
  
        document.write("(a == b) => ");
        result = (a == b);
        document.write(result);
        document.write(linebreak);
     
        document.write("(a < b) => ");
        result = (a < b);
        document.write(result);
        document.write(linebreak);
     
        document.write("(a > b) => ");
        result = (a > b);
        document.write(result);
        document.write(linebreak);
     
        document.write("(a != b) => ");
        result = (a != b);
        document.write(result);
        document.write(linebreak);
     
        document.write("(a >= b) => ");
        result = (a >= b);
        document.write(result);
        document.write(linebreak);
     
        document.write("(a <= b) => ");
        result = (a <= b);
        document.write(result);
        document.write(linebreak);
     
  </script>      

Logical (or Relational) Operators

Assignment Operators

Conditional (or ternary) Operators