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Boolean - Logical Value Type

The boolean type represents logical true/false values in AssemblyScript Stylus smart contracts. It's essential for conditional logic, access control, and state flags.

Overview​

Boolean provides:

  • True/false logical values
  • Conditional logic operations
  • State flag management
  • Access control patterns
  • Simple comparison results

Basic Usage​

Creating Boolean Values​

// Direct boolean values
const isActive: boolean = true;
const isComplete: boolean = false;

// From comparisons
const isGreater: boolean = valueA > valueB;
const isEqual: boolean = addressA.equals(addressB);

Logical Operations​

// AND: both must be true
let result1: boolean = true && false;  // false
let result2: boolean = true && true;   // true

// OR: at least one must be true
let result3: boolean = true || false;  // true
let result4: boolean = false || false; // false

// NOT: inverts the value
let result5: boolean = !true;  // false
let result6: boolean = !false; // true

// In contracts
@View
checkAccess(): boolean {
  return isAdmin && isActive; // true only if both are true
}

@View
canEdit(): boolean {
  return isOwner || isModerator; // true if either is true
}

Simple Examples​

import { Contract, U256, View, External } from "@wakeuplabs/as-stylus";

@Contract
export class BooleanExamples {
  isActive: boolean = true;
  isPaused: boolean = false;

  @External
  toggleActive(): void {
    isActive = !isActive;
  }

  @External
  setPaused(paused: boolean): void {
    isPaused = paused;
  }

  @View
  getStatus(): boolean {
    return isActive && !isPaused;
  }

  @View
  checkCondition(value: U256): boolean {
    return value > U256.from(100);
  }
}