Chunk Array

Author: Tittoh

README.md

@@ -17,3 +17,4 @@ Once inside, run the command below:
 8. Search and Replace
 9. Anagram
 10. Pig-latin
+11. Chunk Array

src/chunkArray/index.js

@@ -0,0 +1,10 @@
+// pick a solution and insert here to run the test.
+
+function chunkArray(array, size) {
+    if(array.length <= size){
+        return [array]
+    }
+    return [array.slice(0,size), ...chunkArray(array.slice(size), size)]
+ }
+
+module.exports = chunkArray;

src/chunkArray/solutions.js

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+// LOOPING THROUGH THE ARRAY
+
+function chunkArray(array, size) {
+    let result = []
+
+    for (value of array){
+
+        let lastArray = result[result.length -1 ]
+        if(!lastArray || lastArray.length == size){
+            result.push([value])
+        }else{
+            lastArray.push(value)
+        }
+    }
+
+    return result
+}
+
+// LOOPING THROUGH THE NUMBER OF CHUNKS
+
+function chunkArray(array, size) {
+    let result = []
+
+    let arrayCopy = [...array]
+
+    while (arrayCopy.length > 0) {
+        result.push(arrayCopy.splice(0, size))
+    }
+
+    return result
+}
+
+
+// USING .SLICE()
+
+function chunkArray(array, size) {
+    let result = []
+
+    for (i = 0; i < array.length; i += size) {
+        let chunk = array.slice(i, i + size)
+        result.push(chunk)
+    }
+
+    return result
+}
+
+//RECURSION
+
+function chunkArray(array, size) {
+    if(array.length <= size){
+        return [array]
+    }
+    return [array.slice(0,size), ...chunkArray(array.slice(size), size)]
+ }
+ 

src/chunkArray/test.js

@@ -0,0 +1,19 @@
+const chunkArray = require('./index');
+
+test('chunkArray is a function', () => {
+  expect(typeof chunkArray).toEqual('function');
+});
+
+test('Chunks array of 10 elements in twos', () => {
+  const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
+  const chunkedArray = chunkArray(arr, 2);
+
+  expect(chunkedArray).toEqual([[1, 2], [3, 4], [5, 6], [7, 8], [9, 10]]);
+});
+
+test('Chunks array of 13 elements in five and some', () => {
+  const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13];
+  const chunkedArray = chunkArray(arr, 5);
+
+  expect(chunkedArray).toEqual([[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13]]);
+});