// 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: string[] = ["Zebra", "Koala", "Lion", "Elephant", "Eagle", "Cat", "Eagle"]

function circulate(list: string[]) {
    if (list.length === 0 ) return []; // since if length of the arry is 0 return not
    const lastElement = list.pop()!;
    list.unshift(lastElement);
    return list; 
}



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: string[] = ["Zebra", "Koala", "Lion", "Elephant", "Eagle", "Cat", "Eagle"];

function getHalf(list: string[]) {
    return list.slice(0, Math.ceil(list.length / 2))
}



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: string[] = ["Lion", "Koala", "Lion", "Elephant", "Eagle", "Cat", "CAT"]

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

console.log(removeDuplicates(array3))
// want [ 'Lion', 'Koala', 'Elephant', 'Eagle', 'Cat' ]

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: string[] = ["Lion", "Cat", "Zebra", "Eagle", "Elephan", "Koala"]

function sortNames(list: string[]) {
    return list.sort()
}