[javascript] add content in number

JavaScript/number/getMaximum.js

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+/*
+ * Copyright 2020 Koddi Evangelista
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//this function will get the maximum number in an array
+const getMax = (array) => {
+  // first, check if the input is an array, if not then return 'not an array'
+  if (!Array.isArray(array)) {
+    return "not an array";
+  }
+  //copy an array using spread operator
+  let arrCopy = [...array];
+  //iterate elements in array using .forEach() method
+  arrCopy.forEach((el, index) => {
+    //remove all the non-number in the array
+    if (typeof el !== "number") {
+      arrCopy.splice(index, 1);
+    }
+  });
+  //sort the array
+  let sortedArray = arrCopy.sort((a, b) => a - b);
+  //and return the last index to get the highest number in an array.
+  return sortedArray[sortedArray.length - 1];
+};
+console.log(getMax([2, 3, "koddi", 5, 6, 7, 8, 9, 1]));

JavaScript/number/getMinimum.js

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+/*
+ * Copyright 2020 Koddi Evangelista
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//this function will get the minimum number in an array
+const getMax = (array) => {
+  // first, check if the input is an array, if not then return 'not an array'
+  if (!Array.isArray(array)) {
+    return "not an array";
+  }
+  let arrCopy = [...array];
+  arrCopy.forEach((el, index) => {
+    if (typeof el !== "number") {
+      arrCopy.splice(index, 1);
+    }
+  });
+  let sortedArray = arrCopy.sort((a, b) => a - b);
+  return sortedArray[0];
+};
+console.log(getMax([2, 3, "koddi", 5, 6, 7, 8, 9, 1]));

JavaScript/number/onlyNegative.js

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+/*
+ * Copyright 2020 Koddi Evangelista
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//this function will return only the negative numbers in an array
+const onlyNegative = (array) => {
+  // first, check if the input is an array, if not then return 'not an array'
+  if (!Array.isArray(array)) {
+    return "not an array";
+  }
+  //create an array where we will put all the negative number of input array
+  let onlyNegative = [];
+  //iterate the elements of array using .forEach() method
+  array.forEach((el, index) => {
+    // check if the type of element is number and is less than 0
+    if (typeof el === "number" && el < 0) {
+      // if the element satisfies the condition push it the the array that we created
+      onlyNegative.push(array[index]);
+    }
+  });
+  // return the onlyPositive array where we allocate all the negative numbers in input array
+  return onlyNegative;
+};
+
+console.log(onlyNegative(["koddi", "angelo", -5, -10, 1, 2, 3, 4]));

JavaScript/number/onlyPositive.js

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+/*
+ * Copyright 2020 Koddi Evangelista
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+//this function will return only the positive numbers in an array
+const onlyPositive = (array) => {
+  // first, check if the input is an array, if not then return 'not an array'
+  if (!Array.isArray(array)) {
+    return "not an array";
+  }
+  //create an array where we will put all the positive number of input array
+  let onlyPositive = [];
+  //iterate the elements of array using .forEach() method
+  array.forEach((el, index) => {
+    // check if the type of element is number and is greater than 0
+    if (typeof el === "number" && el > 0) {
+      // if the element satisfies the condition push it the the array that we created
+      onlyPositive.push(array[index]);
+    }
+  });
+  // return the onlyPositive array where we allocate all the positive numbers in input array
+  return onlyPositive;
+};
+
+console.log(onlyPositive(["koddi", "angelo", -5, -10, 1, 2, 3, 4]));

JavaScript/number/reverseArray.js

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+/*
+ * Copyright 2020 Koddi Evangelista
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+// this function will reverse an array using Array.reverse()
+const reverseArray = (array) => {
+  // first, check if the input is an array, if not then return 'not an array'
+  if (!Array.isArray(array)) {
+    return "not an array";
+  }
+  //use the .reverse() method a build-in method in javascript that reverses an array
+  return array.reverse();
+};
+
+// this function will reverse an array using an algorithm
+const reverseArrayAlgorithm = (array) => {
+  // first, check if the input is an array, if not then return 'not an array'
+  if (!Array.isArray(array)) {
+    return "not an array";
+  }
+  //create a new array where we will place the reversed array
+  let reverseArr = [];
+  //get the length of input array, we will use it to iterating all the elements of array using for-loop
+  let length = array.length;
+  //create a for-loop that iterates the element of an array starting from the highest index to the lowest
+  for (let i = length - 1; i >= 0; i--) {
+    // push each element to the new array that we created
+    reverseArr.push(array[i]);
+  }
+  //return the reversed array
+  return reverseArr;
+};
+
+console.log(reverseArray([4, "koddi", 5, "angelo", 1, 2]));
+console.log(reverseArrayAlgorithm([4, "koddi", 5, "angelo", 1, 2]));