Add javascript section

src/SUMMARY.md

@@ -6,6 +6,8 @@
     - [Web](./dev/web/main.md)
         - [front](./dev/web/front/main.md)
             - [babel and babel-preset-stage-2](./dev/web/front/babel-preset-stage-2.md)
+        - [js](./dev/web/javascript/.md)
+            - [ES6 features](./dev/web/javascript/es6.md)
     - [Tools](./dev/tools/main.md)
         - [Git](./dev/tools/git.md)
         - [SVN](./dev/tools/svn.md)

src/dev/web/javascript/.md

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+# js

src/dev/web/javascript/es6.md

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+# Presentation of the main ES6 features
+
+## Spread Operator
+
+It allows an iterable to expand items in it.
+
+```javascript
+array = [1, 2];
+appended = [3,4];
+
+all = [...aray, ...appended]
+console.log(all)
+```
+
+This can be usefull in some situations like this one :
+
+```javascript
+array = [1, 2, 3, 4];
+console.log(Math.min(...array));
+```
+
+istead of the old syntax
+
+```javascript
+array = [1, 2, 3, 4];
+console.log(Math.min.apply(null, array));
+```
+
+## Rest Operator
+
+Represent infinite number or args in an array
+
+```javascript
+const sum = (...numbers) => {
+    return numbers.reduce((previous, current) => {
+        return previous + current;
+    });
+};
+```
+
+## Arrow Function
+
+Function can now be written like this
+
+```javascript
+const f = (a, b) => a + b;
+console.log(f(1,2));
+```
+
+instead of
+
+```javascript
+function f(a, b) {
+    return a + b;
+}
+console.log(f(1,2));
+```
+
+## Default parameters
+
+With arrow syntax !
+
+```javascript
+const f = (a = 10) => console.log(a);
+f();
+f(1);
+```
+
+## Destructuring (arrays and objects)
+
+With arrays
+
+```javascript
+const array = [1, 2];
+const [a, b] = array;
+console.log(a, b)
+```
+
+or objects
+
+```javascript
+const person = { name: "Jesus", age: "33" };
+const { name, age } = person;
+console.log(name, age);
+```

src/dev/web/javascript/main.md

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+# All js stuff goes here