add objects b00tc4mp#65

staff/tea_kintiraia/prework/objects/addElement.js

@@ -0,0 +1,31 @@
+/*
+function array.push()
+añade en la última posición del array un elemento
+*/
+function addElement(object, element) {
+    //nuestra función añadirá dentro del objeto ->objeto <- en la última
+   // posición -> object.length <- el elemento -> element  <- 
+object[object.length] = element
+//incrementar la longitud -> object.length <- en 1
+object.length++
+}
+var numbers = {
+0: 0,
+1: 1,
+2: 2,
+length: 3
+}
+console.log("PRUEBA 1: añadir el número 3 a numbers")
+addElement(numbers, 3)
+console.log("numbers", numbers)
+console.log("Resultado esperado -> { 0:0, 1:1, 2:2, 3:3, length: 4}")
+addElement(numbers, 100)
+console.log("numbers", number)
+
+
+
+
+
+/*
+array.shift
+*/

staff/tea_kintiraia/prework/objects/addElements.js

@@ -0,0 +1,73 @@
+/*
+array.shift()
+elimina el primer elemento y lo devuelve y modifica la longitud
+*/
+function removeFirstElement(object) {
+    //guardar el valor de la propiedad que vamos a eliminar -> numbers[0]<-
+    var result = object[0]
+    //para borrar la primera propiedad moveriamos todas las de más propiedades -> las propiedades a partir de numbers[0]<-
+    for (var i=0; i < object.length -1; i++) {
+        //numbers[0] = numbers[1]
+        //numbers[1] = numbers[2]
+        object[i] = object[i + 1]
+        //numbers[0] = numbers[1]
+        //numbers[1] = numbers[2]
+    }
+    //eliminar la última propiedad -> numbers.length
+    object.length--
+    return result//la primera propiedad
+}
+
+// var numbers = {
+// 0:1,
+// 1:2
+// length : 2
+//
+//} return 0
+
+//numbers = {
+// 0: 1,
+// 1: 1,
+// 2: 2,
+// length: 3
+//}
+
+// numbers = {
+// 0: 1,
+// 1: 2,
+// 2: 2,
+// length: 3
+// }
+
+var numbers = {
+    0 : 0,
+    1 : 1,
+    2 : 2,
+    length: 3
+}
+console.log("numbers before shift", numbers)
+
+console.log("first element of numbers", removeFirstElement(numbers))
+
+console.log("numbers after shift", numbers)
+
+console.log("first element of numbers after second shift", removeFirstElement(number))
+
+console.log("TEST Array.prototype.push")
+console.log("CASE add 400 to nunms")
+var nums = [100, 200, 300]
+var length = nums.push(400)
+console.log(nums)
+//[100, 200, 300, 400] (4)
+console.log(length)
+//4
+
+console.log("CASE add F to chars")
+
+var chars = ["A", "B", "C", "D", "E"]
+var length = chars.push("F")
+console.log(chars)
+// ["A", "B", "C", "D", "E", "F"] (6)
+console.log(length)
+// 6
+

staff/tea_kintiraia/prework/objects/addFirstEelement.js

@@ -0,0 +1,74 @@
+/*
+array.shift()
+elimina el primer elemento y lo devuelve y modifica la longitud
+*/
+function removeFirstElement(object) {
+    //guardar el valor de la propiedad que vamos a eliminar -> numbers[0]<-
+    var result = object[0]
+    //para borrar la primera propiedad moveriamos todas las de más propiedades -> las propiedades a partir de numbers[0]<-
+    for (var i = 0; i < object.length - 1; i++) {
+        //numbers[0] = numbers[1]
+        //numbers[1] = numbers[2]
+        object[i] = object[i + 1]
+        //numbers[0] = numbers[1]
+        //numbers[1] = numbers[2]
+    }
+    //eliminar la última propiedad -> numbers.length
+    object.length--
+    return result//la primera propiedad
+}
+
+// var numbers = {
+// 0:1,
+// 1:2
+// length : 2
+//
+//} return 0
+
+//numbers = {
+// 0: 1,
+// 1: 1,
+// 2: 2,
+// length: 3
+//}
+
+// numbers = {
+// 0: 1,
+// 1: 2,
+// 2: 2,
+// length: 3
+// }
+
+var numbers = {
+    0: 0,
+    1: 1,
+    2: 2,
+    length: 3
+}
+console.log("numbers before shift", numbers)
+
+console.log("first element of numbers", removeFirstElement(numbers))
+
+console.log("numbers after shift", numbers)
+
+console.log("first element of numbers after second shift", removeFirstElement(number))
+
+console.log("TEST Array.prototype.push")
+console.log("CASE add 400 to nunms")
+var nums = [100, 200, 300]
+var length = nums.push(400)
+console.log(nums)
+
+//[100, 200, 300, 400] (4)
+console.log(length)
+//4
+
+console.log("CASE add F to chars")
+
+var chars = ["A", "B", "C", "D", "E"]
+var length = chars.push("F")
+console.log(chars)
+// ["A", "B", "C", "D", "E", "F"] (6)
+console.log(length)
+// 6
+