Primitive Types & Conditionals

1. JavaScript Values

Basically In JavaScript values are of two categories.

Primitive Type	Description
Number	All the numbers are of Number type.
Boolean	Boolean values are either true or false.
String	String is a stream of characters. The String should be enclosed with Single quotes, Double quotes, or Backticks.
Undefined	If a value is not assigned to the variable, then it takes undefined as its value. In JS, undefined refers to the value that is not being assigned.

The

typeof()

operator is used to find the type of value.

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let a = 900;
let b = 9.2;
console.log(typeof(a));  // number
console.log(typeof(b));  // number

JAVASCRIPT

Try out changing the different Values in the below Code Playground and check the output in the console.

let isApproved = false; console.log(typeof(isApproved)); console.log(typeof(true));

In JavaScript, when we combine the number and string, it results in a string.

The

parseInt()

function accepts a string and converts it into an integer.

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let a = '20';
console.log(typeof(a));  // string  
let b = parseInt(a);
console.log(typeof(b));  // number

JAVASCRIPT

The Conditional Statement allows you to execute a block of code only when a specific condition is true.

If...Else Statement:

Syntax:

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if (conditionA) {
  Block1;
}
else if (conditionB) {
  Block2;
}
else {
  Block3;
}

JAVASCRIPT

Try out changing the colors, increment, and decrement Values in the below Code Playground and check the output.