variables.js

/*
    * variables
    ****************/

    // string
    let name = "John Smith"  
    const id = 'SFF-9435' 
 
    console.log(name)
    
    // numbers
    let age = 45             
    let height = 1.65        
    
    // boolean 
    let married = true       
    let with_child = false  
 
    // objects
    const address = {
     city: "Goma",
     street: "President de la République",
     country: "DRC"
    }
 
    // others
    let person         // undefined
    const phone = null // null
 
    /*
     * arithmetic operations */
 
     const a = 12
     const b = 9
 
     const sum = a + b       // sum
     const subtract = a - b  // subtraction
     const multiply = a * b  // multiplication
     const divide = a / b    // division
     const modulo = a % b    // modulo
 
     console.log(`${a} + ${b} = ${sum}`)
     console.log(`${a} - ${b} = ${subtract}`)
     console.log(`${a} / ${b} = ${divide}`)
     console.log(`${a} % ${b} = ${modulo}`)