Avoid unnecessary ternary operations that return a boolean

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Metadata

ID: typescript-best-practices/no-unnecessary-ternary

Language: TypeScript

Severity: Warning

Category: Best Practices

Description

This rule advises against the use of unnecessary ternary operations that return a boolean value. In JavaScript, the ternary operator ? : is a shorthand way of writing an if-else statement. However, if the result of the ternary operation is a boolean (such as true or false), it is often unnecessary because the condition itself already produces a boolean value.

The use of unnecessary ternary operations can lead to code that is harder to read and understand. Furthermore, it can lead to potential bugs if the ternary operation is not correctly written or understood. To adhere to this rule, you should return the condition itself rather than using a ternary operation.

Non-Compliant Code Examples

const foo = bar === 2 ? true : false;
const baz = quux === 3 ? false : true;
const notFoo = foo ? false : true;
call(foo ? foo : 1);

Compliant Code Examples

const foo = bar === 2;
const baz = quux !== 3;
const notFoo = !foo;
call(foo || 1);