Initial submit for Array Methods Lab

problems/arrayMethods.js

@@ -5,7 +5,17 @@
  * @returns {number} Sum of all numbers
  */
 
-const sumArray = () => {};
+const sumArray = (nums) => {
+  let sum = 0
+  nums.forEach((nums) => {
+    sum += nums
+
+  })
+  return sum
+
+};
+
+// test: console.log(sumArray([1, 1, 1, 1]))
 
 /**
  * Takes in an array of numbers and returns the amount of zeros that occur in it.
@@ -14,7 +24,12 @@ const sumArray = () => {};
  * Must use forEach
  */
 
-const zeroCount = () => {};
+const zeroCount = (nums) => {
+  let numOfZero = 0
+  nums.forEach(num => num === 0 ? numOfZero += 1 : false)
+  return numOfZero
+
+};
 
 /**
  * Takes in an array of numbers and returns a new array where each
@@ -24,7 +39,13 @@ const zeroCount = () => {};
  * @returns {number[]} Array with each previous number plus 10.
  */
 
-const plusTen = () => {};
+const plusTen = (nums) => {
+ return nums.map(num => {
+  return num += 10
+
+ }) 
+}
+
 
 /**
  * Takes in an array and returns a new array where every non-string
@@ -36,7 +57,21 @@ const plusTen = () => {};
  * @returns {string[]} All strings remain, all non strings are now empty strings.
  */
 
-const stringsOnly = () => {};
+const stringsOnly = (items) => {
+
+  return items.map(item => {
+      if(typeof(item) !== 'string'){
+          return ""
+      }
+      else{
+          return item
+      }
+
+
+  })
+}
+
+
 
 /**
  * Takes in an array and returns a new array with only the even elements.
@@ -45,7 +80,15 @@ const stringsOnly = () => {};
  * @returns {number[]} Only even valued elements
  */
 
-const onlyEvens = () => {};
+const onlyEvens = (nums) => {
+
+  return nums.filter(num => {
+      return num % 2 === 0
+
+
+  })
+
+}
 
 /**
  * Takes in an array and returns a new array with only the elements
@@ -55,7 +98,16 @@ const onlyEvens = () => {};
  * @returns {number[]} Only number items should remain.
  */
 
-const numbersOnly = () => {};
+const numbersOnly = (items) => {
+    return items.filter(item =>{
+      if (typeof(item) === 'number'){
+          return true
+      }
+    })
+}
+
+// test: console.log(numbersOnly(["cat", 0, { hi: "corey" }, [], 2, -3]))
+
 
 /**
  * Takes in an array and checks if all elements in the array are the same.
@@ -64,15 +116,27 @@ const numbersOnly = () => {};
  * @returns {boolean} Whether or not all elements are the same.
  */
 
-const isAllSame = () => {};
+const isAllSame = (items) => {
+  return items.every(item =>{
+
+    return items[0] === item
+
+
+  })
+
+  }
+
 
 /**
  * Takes in an array and returns whether or not all elements in the array are odd.
  * @param {number[]} nums
  * @returns {boolean} All odd?
  */
 
-const isAllOdd = () => {};
+const isAllOdd = (nums) => {
+  return nums.every(num => num % 2 === 1)
+
+};
 
 /**
  * Takes in an array of numbers and a target.
@@ -82,7 +146,18 @@ const isAllOdd = () => {};
  * @returns {number} Number of target occurrences
  */
 
-const targetCount = () => {};
+const targetCount = (nums, target) => {
+let start = nums[0]
+nums.forEach(()=>{})
+
+
+
+}
+
+
+
+
+};
 
 /**
  * Takes in an array of elements and returns an Object that contains