CoffeeScript - Assignment operators

CoffeeScript supports the following assignment operators −

Sr.No Operator and Description Example
1

= (Simple Assignment )

Assigns values from the right side operand to the left side operand

 C = A + B will assign the value of A + B into C
2

+= (Add and Assignment)

It adds the right operand to the left operand and assigns the result to the left operand.

 C += A is equivalent to C = C + A
3

-= (Subtract and Assignment)

It subtracts the right operand from the left operand and assigns the result to the left operand.

 C -= A is equivalent to C = C - A
4

*= (Multiply and Assignment)

It multiplies the right operand with the left operand and assigns the result to the left operand.

 C *= A is equivalent to C = C * A
5

/= (Divide and Assignment)

It divides the left operand with the right operand and assigns the result to the left operand.

 C /= A is equivalent to C = C / A
6

%= (Modules and Assignment)

It takes modulus using two operands and assigns the result to the left operand.

 C %= A is equivalent to C = C % A

Note − Same logic applies to Bitwise operators so they will become like <<=, >>=, >>=, &=, |= and ^=.

Example

The following example demonstrates the usage of assignment operators in CoffeeScript. Save this code in a file with name assignment _example.coffee

a = 33
b = 10

console.log "The value of a after the operation (a = b) is "
result = a = b
console.log result

console.log "The value of a after the operation (a += b) is "
result = a += b
console.log result

console.log "The value of a after the operation (a -= b) is "
result = a -= b
console.log result

console.log "The value of a after the operation (a *= b) is "
result = a *= b
console.log result

console.log "The value of a after the operation (a /= b) is "
result = a /= b
console.log result

console.log "The value of a after the operation (a %= b) is "
result = a %= b
console.log result

Open the command prompt and compile the .coffee file as shown below.

c:/> coffee -c assignment _example.coffee

On compiling, it gives you the following JavaScript.

// Generated by CoffeeScript 1.10.0
(function() {
  var a, b, result;
  a = 33;
  b = 10;

  console.log("The value of a after the operation (a = b) is ");
  result = a = b;
  console.log(result);

  console.log("The value of a after the operation (a += b) is ");
  result = a += b;
  console.log(result);

  console.log("The value of a after the operation (a -= b) is ");
  result = a -= b;
  console.log(result);

  console.log("The value of a after the operation (a *= b) is ");
  result = a *= b;
  console.log(result);

  console.log("The value of a after the operation (a /= b) is ");
  result = a /= b;
  console.log(result);

  console.log("The value of a after the operation (a %= b) is ");
  result = a %= b;
  console.log(result);

}).call(this);

Now, open the command prompt again and run the CoffeeScript file as shown below.

c:/> coffee assignment _example.coffee

On executing, the CoffeeScript file produces the following output.

The value of a after the operation (a = b) is
10
The value of a after the operation (a += b) is
20
The value of a after the operation (a -= b) is
10
The value of a after the operation (a *= b) is
100
The value of a after the operation (a /= b) is
10
The value of a after the operation (a %= b) is
0
coffeescript_operators_and_aliases.htm
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