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let num1=5;

num1=10;
var num2=25;

document.write("The ratio between both numbers is:"+ num1+":"+num2);
</SCRIPT>

</BODY>
</HTML>

KEYWORDS
Keywords are reserved words in JavaScript that have been assigned a specific meaning or task.

They cannot be used for any other purpose. Common JavaScript keywords include:

await break case catch class const continue
debugger default delete do else enum export

extends false finally for function if implements

import in instanceof interface let new null

package private protected public return super switch

static this throw try true typeof var

void while with yield

OPERATORS

Operators are symbols used to perform mathematical, logical and relational operations on values
and variables. The values or variables they operate on are called operands. Common JavaScript
operators include arithmetic, assignment, comparison and logical operators.

Arithmetic Operators
Arithmetic operators are used to perform mathematical operations on numbers in JavaScript.
JavaScript provides the following arithmetic operators:

Example
Operator Name Description Output
(a = 11, b = 4)

+ Addition Adds two operands. a + b 15
– Subtraction Subtracts the operand written on the a – b 7
right-hand side of the operator from the
operand written on the left side.

* Multiplication Multiplies both operands. a * b 44

/ Division Divides numerator by denominator. a / b 2.75

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JavaScript for Beginners