Expressions and Operators

 

Operators

An operator is a symbol or set of symbols that perform a specific operation like adding, subtracting, comparing, incremining, and assigning values. operators in JavaScript can be classified into 3 types (based on number of operands):

1. Uniray operators, in which a single operand (anything with value) is needed to complete the operation like increminting e.g. 1++
2. Binary operators, here two operands are needed like summation and multiplication and comparison
3. Ternary operator, JavaScript has only one ternary operator which is the conditional operator i.e. condition ? val1 : val2   Another famous classification for operators is shown in the image below

 

 

Some operators and their functions

Operator	Operation	Example	Result
+	summation	10 + 124	134
*	multiplication	x*5	multiplies the value of x by 5
/	multiplication	x/5	divides the value of x by 5
>	check if greater than	age < 18	checks if the value of age is less than 18
<=	check if less or equal	12 <= 7	false
=	assign value	x=5	stores 5 on var x

     

Loops

Loops are used to repeat a code or set of codes without the need to rewrite them, here the syntax of for and while loop:

1. for loop: for (var i = 0; i < number; i++) { syntax } here you control the number of repitions

2. while (i < number) { syntax } here the loop will repeat until the conditoin is met