fdsa

LabArrays2.js

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+
+// 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))