The if statement

Learn how to check a condition with if.

The if statement

In Dart you check a condition with if. If the condition is true the block runs; if false it is skipped. The form is if (condition) { ... }.

For example int score = 85; if (score >= 50) { print("passed"); } prints passed because score >= 50 is true. The condition goes inside parentheses; the block inside curly braces.

Condition and block

After if a condition is written inside parentheses. The condition must be a bool expression: true or false. Comparison operators (==, !=, <, >, <=, >=) or logical operators (&&, ||, !) produce one.

When the condition is true the block inside the curly braces runs. For single-line blocks the braces are technically optional but always recommended for readability.

Exercise Print passed/failed

Declare an int variable score with the value 85. Check the condition with if (score >= 50); when true print print("passed");. The output on a single line must be passed.

Show example solution

int score = 85;
if (score >= 50) {
  print("passed");
}

Test yourself

Which is a correct if form?
```
int x = 10;
```
- if (x > 5) print(x);)
- if x > 5 { print(x); }
- if (x > 5) { print(x); }
- if [x > 5] { print(x); }
Show answer

if (x > 5) { print(x); } — The condition goes in parentheses; the block in curly braces.

Complete the if condition

int score = 85;
if (____) {
  print("passed");
}

Show answer

int score = 85;
if (score >= 50) {
  print("passed");
}

Match each part to its job

if

Condition statement
(cond)

Condition in parens
{ ... }

Block
score >= 50

Comparison example

Next lesson: else and else if

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