Day 4 of 100: Operators and Conditionals — The Logic of Assertions

Day 4 of 100 — 100 Days of Playwright with TypeScript Challenge. Phase: JavaScript Fundamentals. JavaScript (Days 1-33) → TypeScript (Days 34-63) → Playwright (Days 64-96) → AI Framework Capstone (Days 97-100).

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Every test assertion is a conditional. Master comparison and logical operators.

Comparison Operators

const price = 99.99;
price === 99.99   // strict equal — use this
price !== 100     // strict not equal
price > 50        // greater
price <= 99.99    // less or equal

Logical Operators in Test Logic

const status = 200;
const hasBody = true;

// AND — both must pass
if (status === 200 && hasBody) { console.log('valid response'); }

// OR — fallback values
const timeout = userTimeout || 30000;

// NOT
if (!errorVisible) { console.log('no errors shown'); }

Ternary and Guard Patterns

const env = process.env.CI ? 'ci' : 'local';
const retries = env === 'ci' ? 2 : 0;

// Early return guard — cleaner than nested ifs
function validate(user) {
  if (!user) return 'FAIL: no user';
  if (!user.email) return 'FAIL: no email';
  return 'PASS';
}

Tomorrow (Day 5): Loops — iterating test data and retry logic.