In this tutorial, we will learn about if statements in TypeScript. We will cover the basics of conditional execution using if statements.
An if statement is a conditional statement that executes a block of code if a specified condition is true.
The syntax for the if statement in TypeScript is:
if (condition) {
// Code block to execute if condition is true
}
The if statement evaluates the specified condition. If the condition is true, the code block inside the if statement is executed; otherwise, it is skipped.
The following is the flowchart of how execution flows from start to the end of an if statement.
num
with type number
.num
.num
is even.num
is even or not.let num: number = 10;
if (num % 2 === 0) {
console.log(`${num} is even.`);
}
10 is even.
str
with type string
.str
.str
starts with a specific value.let str: string = 'Hello, world!';
if (str.startsWith('Hello')) {
console.log("String starts with 'Hello'.");
}
String starts with 'Hello'.
num
with type number
.num
.num
is positive.num
is positive or not.let num: number = -5;
if (num > 0) {
console.log(`${num} is positive.`);
}