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  1. Prepare
  2. Tutorials
  3. 30 Days of Code
  4. Day 4: Class vs. Instance
  5. Discussions

Day 4: Class vs. Instance

  • demianmyers
     + 0 comments

    TypeScript solution. Note, I added an ageBy helper method to the Person class for to DRY up duplicate aging code :

    function main() {
    // Enter your code here
    
    const testAmount = Number(readLine())
    
    const lastTestIndex = 4
    
    Array.from({length: testAmount}).forEach((_, index) => {
        const p1 = new Person(Number(readLine()))
        p1.amIOld()
        p1.ageByYears(3)
        p1.amIOld()
        
        if (index !== lastTestIndex) process.stdout.write('\n')
    })
}

class Person {
    age = 0
    
    constructor(initalAge: number) {
        if (initalAge < 0) {
            process.stdout.write('Age is not valid, setting age to 0.\n')
            return
        }
        
        this.age = initalAge
    }
    
    yearPasses(): void {
        this.age++
    } 
    
    amIOld(): void {
        if (this.age < 13) {
            process.stdout.write('You are young.\n')
        } else if (this.age >= 13 && this.age < 18) {
            process.stdout.write('You are a teenager.\n')
        } else {
            process.stdout.write('You are old.\n')
        }
    }
    
    ageByYears(years: number) {
        Array.from({length: years}).forEach(_ => this.yearPasses())
    }
}