prefer-exponentiation-operator

Disallow the use of Math.pow in favor of the ** operator

Introduced in ES2016, the infix exponentiation operator ** is an alternative for the standard Math.pow function.

Infix notation is considered to be more readable and thus more preferable than the function notation.

Rule Details

This rule disallows calls to Math.pow and suggests using the ** operator instead.

Examples of incorrect code for this rule:

/*eslint prefer-exponentiation-operator: "error"*/

const foo = Math.pow(2, 8);

const bar = Math.pow(a, b);

let baz = Math.pow(a + b, c + d);

let quux = Math.pow(-1, n);
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Examples of correct code for this rule:

/*eslint prefer-exponentiation-operator: "error"*/

const foo = 2 ** 8;

const bar = a ** b;

let baz = (a + b) ** (c + d);

let quux = (-1) ** n;
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When Not To Use It

This rule should not be used unless ES2016 is supported in your codebase.

Version

This rule was introduced in ESLint v6.7.0.

Further Reading

Exponentiation (**) - JavaScript | MDN
developer.mozilla.org

5848 - v8 - V8 JavaScript Engine - Monorail
bugs.chromium.org

Resources

• Rule source
• Tests source