Use const instead of let

Author: tshemsedinov

.eslintrc.yml

@@ -0,0 +1,139 @@
+parserOptions:
+  ecmaVersion: 6
+env:
+  node: true
+extends: 'eslint:recommended'
+rules:
+  indent:
+    - error
+    - 2
+    - SwitchCase: 1
+      VariableDeclarator:
+        var: 2
+        let: 2
+        const: 3
+      MemberExpression: 1
+  linebreak-style:
+    - error
+    - unix
+  quotes:
+    - error
+    - single
+  semi:
+    - error
+    - always
+  eqeqeq:
+    - error
+    - always
+  no-loop-func:
+    - error
+  strict:
+    - error
+    - global
+  block-spacing:
+    - error
+    - always
+  brace-style:
+    - error
+    - 1tbs
+    - allowSingleLine: true
+  camelcase:
+    - error
+  comma-style:
+    - error
+    - last
+  comma-spacing:
+    - error
+    - before: false
+      after: true
+  eol-last:
+    - error
+  func-call-spacing:
+    - error
+    - never
+  key-spacing:
+    - error
+    - beforeColon: false
+      afterColon: true
+      mode: minimum
+  keyword-spacing:
+    - error
+    - before: true
+      after: true
+      overrides:
+        function:
+          after: false
+  max-len:
+    - error
+    - code: 80
+      ignoreUrls: true
+  max-nested-callbacks:
+    - error
+    - max: 5
+  new-cap:
+    - error
+    - newIsCap: true
+      capIsNew: true
+      properties: true
+  new-parens:
+    - error
+  no-lonely-if:
+    - error
+  no-trailing-spaces:
+    - error
+  no-unneeded-ternary:
+    - error
+  no-whitespace-before-property:
+    - error
+  object-curly-spacing:
+    - error
+    - always
+  operator-assignment:
+    - error
+    - always
+  operator-linebreak:
+    - error
+    - after
+  semi-spacing:
+    - error
+    - before: false
+      after: true
+  space-before-blocks:
+    - error
+    - always
+  space-before-function-paren:
+    - error
+    - never
+  space-in-parens:
+    - error
+    - never
+  space-infix-ops:
+    - error
+  space-unary-ops:
+    - error
+    - words: true
+      nonwords: false
+      overrides:
+        typeof: false
+  no-unreachable:
+    - error
+  no-global-assign:
+    - error
+  no-self-compare:
+    - error
+  no-unmodified-loop-condition:
+    - error
+  no-constant-condition:
+    - error
+    - checkLoops: false
+  no-console:
+    - off
+  no-useless-concat:
+    - error
+  no-useless-escape:
+    - error
+  no-shadow-restricted-names:
+    - error
+  no-use-before-define:
+    - error
+    - functions: false

JavaScript/4-for-in.js

@@ -1,8 +1,8 @@
 'use strict';
 
-let arr = [7, 10, 1, 5, 2];
+const arr = [7, 10, 1, 5, 2];
 arr.field = 'Value';
 
 for (let i in arr) {
-   console.log(i);
+  console.log(i);
 }

JavaScript/5-for-of.js

@@ -1,8 +1,8 @@
 'use strict';
 
-let arr = [7, 10, 1, 5, 2];
+const arr = [7, 10, 1, 5, 2];
 arr.field = 'Value';
 
 for (let i of arr) {
-   console.log(i);
+  console.log(i);
 }

JavaScript/8-forEach.js

@@ -1,6 +1,6 @@
 'use strict';
 
-let a = [7, 10, 1, 5, 2];
+const a = [7, 10, 1, 5, 2];
 
 a.forEach(function(item, i, arr) {
   console.log(i, arr, item);

JavaScript/9-map.js

@@ -1,5 +1,5 @@
 'use strict';
 
-let log = s => console.log(s);
+const log = s => console.log(s);
 
 [7, 10, 1, 5, 2].map(x => x * 2).map(log);