// humberto mundo



// Objective: shift() and push()
// Write a function named circulate(list). This function takes an array as parameter and 
// returns the same array but the elements move up one spot. For example, say the 
// array is ["Zebra", "Koala", "Lion", "Elephan", "Eagle", "Cat", "Eagle"], circulate will
// return ["Eagle", "Zebra", "Koala", "Lion", "Elephant", "Eagle", "Cat"]
let array1 = ["Zebra", "Koala", "Lion", "Elephant", "Eagle", "Cat", "Eagle"]

function circulate(list) {
    if (list.length === 0 ) return []; // since if length of the arry is 0 return nothing
    const lastElement = list.pop();
    list.unshift(lastElement);
    return list; 
}

console.log(circulate(array1))

console.log()
console.log()

// Objective: slice(1, 5)
// Write a function named getHalf(). This function takes an array as a parameter and copies 
// the first half of an array and returns it. if the the array contains odd number of elements, 
// the middle element should belong to the first half. 
// For example ["Zebra", "Koala", "Lion", "Elephan", "Eagle", "Cat", "Eagle"], this function 
// return ["Zebra", "Koala", "Lion", "Elephant"]

let array2 = ["Zebra", "Koala", "Lion", "Elephant", "Eagle", "Cat", "Eagle"];

function getHalf(list) {
    if (list.length === 1) return list
    // docs say Math.ceil() "returns the smallest integer greater than or equal to its number argument " in short terms rounds ups the number
    return list.slice(0, Math.round(list.length / 2))    
}

console.log(getHalf(array2))

console.log()
console.log()

// Write a function named removeDuplicates(). This function takes an array as a parameter, removes,
// all duplicates and returns the new array (without duplicates)
// For example ["Lion", "Koala", "Lion", "Elephan", "Eagle", "Cat", "CAT"], this function 
// return ["Lion", "Koala", "Elephant", "Eagle", "Cat"],

let array3 = ["Lion", "Koala", "Lion", "Elephant", "Eagle", "Cat", "CAT"]

function removeDuplicates(list) {
    let seen = new Set(); // create new collection
    for (let i = 0; i < list.length; i++) {
        let item = list[i]
        // console.log(!seen.has(item))
        if(!seen.has(item.toLowerCase())) {
            seen.add(item.toLowerCase()) // add to new collection
            list.splice(list.indexOf(item), list.indexOf(item))
            // console.log(`added ${item.toLowerCase()}`)
        }        
    }
    return list
}

console.log(removeDuplicates(array3))

console.log()
console.log()
// Write a function named sortNames(). This function takes an array as a parameter, 
// and returns a new array but with names sorted in ascending order
// For example say list = ["Lion", "Cat", "Zebra", "Eagle", "Elephan", "Koala"], the 
// folowing call sortNames(list) will return
//                      ["Cat", "Eagle", "Elephan", "Koala", "Lion", "Zebra"]

let array4 = ["Lion", "Cat", "Zebra", "Eagle", "Elephan", "Koala"]

function sortNames(list) {
    return list.sort()
}

console.log(sortNames(array4))