Operators and Loops

JavaScript has both binary and unary operators, and one special ternary operator, the conditional operator. A binary operator requires two operands, one before the operator and one after the operator:

JavaScript has the following types of operators :

• Assignment operators

  An assignment operator assigns a value to its left operand based on the value of its right operand.

• Comparison operators

  A comparison operator compares its operands and returns a logical value based on whether the comparison is true. The operands can be numerical, string, logical, or object values.

• Arithmetic operators

  An arithmetic operator takes numerical values (either literals or variables) as their operands and returns a single numerical value.

• Bitwise operators

  A bitwise operator treats their operands as a set of 32 bits (zeros and ones), rather than as decimal, hexadecimal, or octal numbers.

• Logical operators

  Logical operators are typically used with Boolean (logical) values; when they are, they return a Boolean value. However, the && and

  operators actually return the value of one of the specified operands, so if these operators are used with non-Boolean values, they may return a non-Boolean value.

• String operators

  In addition to the comparison operators, which can be used on string values, the concatenation operator (+) concatenates two string values together, returning another string that is the union of the two operand strings.

• Conditional (ternary) operator

The conditional operator is the only JavaScript operator that takes three operands. The operator can have one of two values based on a condition.

• Comma operator

  The comma operator (,) evaluates both of its operands and returns the value of the last operand.

• Unary operators

  A unary operation is an operation with only one operand.

• Relational operators

  A relational operator compares its operands and returns a Boolean value based on whether the comparison is true.

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Loops (for , while Statement)

• **FOR Statement

A for loop repeats until a specified condition evaluates to false. A for statement looks as follows:

for ([initialExpression]; [conditionExpression]; [incrementExpression]) statement

• do…while statement

  The do…while statement repeats until a specified condition evaluates to false.

A do…while statement looks as follows:

do

statement

while (condition);

• while statement

A while statement executes its statements as long as a specified condition evaluates to true.

A while statement looks as follows:

while (condition)

statement

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