#100DaysOfCode - Day 5

nerojiang · nerojiang · commit d1c890fbf109 · 2017-01-24T21:57:41.000+08:00
Practice functions of array
diff --git a/04 - Array Cardio Day 1/array.js b/04 - Array Cardio Day 1/array.js
@@ -0,0 +1,44 @@
+var fruits = ["Apple", "Banana"];
+
+// Loop over an Array
+fruits.forEach(function (item, index, array) {
+  console.log(item, index);
+});
+// Apple 0
+// Banana 1
+
+// Add to the end of an Array
+var newLength = fruits.push("Orange");
+// ["Apple", "Banana", "Orange"]
+
+// Remove from the end of an Array
+var last = fruits.pop(); // remove Orange (from the end)
+// ["Apple", "Banana"];
+
+// Remove from the front of an Array
+var first = fruits.shift(); // remove Apple from the front
+// ["Banana"];
+
+// Add to the front of an Array
+var newLength = fruits.unshift("Strawberry") // add to the front
+// ["Strawberry", "Banana"];
+
+// Find the index of an item in the Array
+fruits.push("Mango");
+// ["Strawberry", "Banana", "Mango"]
+var pos = fruits.indexOf("Banana");
+// 1
+
+// Remove an item by Index Position
+var removedItem = fruits.splice(pos, 1); // this is how to remove an item,
+// ["Strawberry", "Mango"]
+
+// Remove items from an Index Position
+var removedItems = fruits.splice(pos, n); // this is how to remove items, n defines the number of items to be removed,
+                                          // from that position onward to the end of array.
+// let, n = 1;
+// ["Strawberry"]
+
+// Copy an Array
+var shallowCopy = fruits.slice(); // this is how to make a copy
+// ["Strawberry"]
diff --git a/04 - Array Cardio Day 1/index-START.html b/04 - Array Cardio Day 1/index-START.html
@@ -31,15 +31,31 @@
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
+    var filteredArray = inventors.filter(function(value) {
+      return value.year >= 1500 && value.year < 1600;
+    });
+    console.log(filteredArray);
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
+    var mappedArray = inventors.map(function(value) {
+      return {"first": value.first, "last": value.last};
+    });
+    console.log(mappedArray);
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
+    var sortedArray = inventors.sort(function(val1, val2) {
+      return val1.year - val2.year;
+    });
+    console.log(sortedArray);
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    const totalYears = inventors.reduce((total, inventor) =>  {
+      return total + (inventor.passed - inventor.year);
+    });
+    console.log(totalYears);
 
     // 5. Sort the inventors by years lived
 
