# Art of Programming Patterns in Dart What Are Programming Patterns?

Programming patterns, also known as design patterns, are reusable solutions to common programming problems. They are a way of organizing code that makes it more modular, maintainable, and extensible. In short, programming patterns help developers write better code. Dart, being a modern programming language, offers several built-in patterns that can be used to solve different problems. Star Patterns

Star patterns are a popular type of programming pattern that involves printing various shapes and designs using asterisks or other characters. Here are 5 examples of star patterns in Dart:

### 1. Square Pattern

``````void squarePattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= n; j++) {
print("*");
}
print("");
}
}``````

This program prints a square pattern of n rows and n columns.

### 2. Right Triangle Pattern

``````void rightTrianglePattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
print("*");
}
print("");
}
}``````

This program prints a right triangle pattern of n rows.

### 3. Left Triangle Pattern

``````void leftTrianglePattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = n; j > i; j--) {
print(" ");
}
for (int k = 1; k <= i; k++) {
print("*");
}
print("");
}
}``````

This program prints a left triangle pattern of n rows.

### 4. Diamond Pattern

``````void diamondPattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = n; j > i; j--) {
print(" ");
}
for (int k = 1; k <= (2 * i - 1); k++) {
print("*");
}
print("");
}
for (int i = n - 1; i >= 1; i--) {
for (int j = n; j > i; j--) {
print(" ");
}
for (int k = 1; k <= (2 * i - 1); k++) {
print("*");
}
print("");
}
}``````

This program prints a diamond pattern of n rows.

### 5. Hourglass Pattern

``````void hourglassPattern(int n) {
for (int i = n; i >= 1; i--) {
for (int j = n; j > i; j--) {
print(" ");
}
for (int k = 1; k <= (2 * i - 1); k++) {
print("*");
}
print("");
}
for (int i = 2; i <= n; i++) {
for (int j = n; j > i; j--) {
print(" ");
}
for (int k = 1; k <= (2 * i - 1); k++) {
print("*");
}
print("");
}
}``````

This program prints an hourglass pattern of n rows.

## Number Patterns

Number patterns are another type of programming pattern that involves printing various numerical designs. Here are 3 examples of number patterns in Dart:

### 6. Number Pyramid Pattern

``````void numberPyramidPattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= (n - i); j++) {
print(" ");
}
for (int k = 1; k <= i; k++) {
print(k);
print(" ");
}
print("");
}
}``````

This program prints a number pyramid pattern of n rows.

### 7. Number Diamond Pattern

``````void numberDiamondPattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = n; j > i; j--) {
print(" ");
}
for (int k = 1; k <= (2 * i - 1); k++) {
print(i);
}
print("");
}
for (int i = n - 1; i >= 1; i--) {
for (int j = n; j > i; j--) {
print(" ");
}
for (int k = 1; k <= (2 * i - 1); k++) {
print(i);
}
print("");
}
}``````

This program prints a number diamond pattern of n rows.

### 8. Fibonacci Series Pattern

``````void fibonacciSeriesPattern(int n) {
int a = 0, b = 1, c;
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
print(a);
c = a + b;
a = b;
b = c;
}
print("");
}
}``````

This program prints a Fibonacci series pattern of n rows.

## Character Patterns

Character patterns involve printing various shapes and designs using characters other than asterisks or numbers. Here are 2 examples of character patterns in Dart:

### 9. Arrow Pattern

``````void arrowPattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= i; j++) {
print("");
}
print("");
}
for (int i = n - 1; i >= 1; i--) {
for (int j = 1; j <= i; j++) {
print("");
}
print("");
}
for (int i = 1; i <= (2 * n - 1); i++) {
print("*");
}
}``````

This program prints an arrow pattern of n rows.

### 10. Pyramid Pattern

``````void pyramidPattern(int n) {
for (int i = 1; i <= n; i++) {
for (int j = 1; j <= (n - i); j++) {
print(" ");
}
for (int k = 1; k <= (2 * i - 1); k++) {
print("#");
}
print("");
}
}``````

This program prints a pyramid pattern of n rows.

## Conclusion

Programming patterns are a crucial aspect of writing efficient and maintainable code. Dart offers several built-in patterns that can be utilized to create complex and aesthetically pleasing designs. In this article, we covered 10 different types of programming patterns in Dart, including star, number, and character patterns. These patterns are useful not only for their visual appeal but also for their ability to improve code readability and organization.

By mastering these patterns, you can elevate your Dart programming skills and create code that is both efficient and visually appealing. With practice, you can even create your own custom patterns that suit your project's specific needs.

Happy coding!

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