Reassignment should not be made to a variable that is declared using const keyword

• BAD_ASSIGN_TO_CONST
• Error
• High
• es6

This rule applies when reassignment is made to a variable declared using const keyword.

The value of the const variable is constant in block-scope. So a TypeError exception occurs when the const variable is reassigned in block-scope.

This rule also applies to using and await using variables for explicit resource management because they are also read-only.

Noncompliant Code Example

// Example 1
const A = 1;
A = A + 1; // BAD_ASSIGN_TO_CONST alarm

// Example 2
const MY_OBJECT = { key1: 'value1' };
MY_OBJECT = { key2: 'value2' }; // BAD_ASSIGN_TO_CONST alarm

// Example 3
const MY_ARRAY = [];
MY_ARRAY = ["A"]; // BAD_ASSIGN_TO_CONST alarm

Compliant Code Example

// Example 1
let A = 1;
A = A + 1;

// Example 2
const MY_OBJECT = { key1: 'value1' };
MY_OBJECT.key2 = "value2";

// Example 3
const MY_ARRAY = [];
MY_ARRAY.push("A");

Version

This rule was introduced in DeepScan 1.0.0-alpha.

See

• const