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useExponentiationOperator

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Diagnostic Category: lint/style/useExponentiationOperator

Since: v1.0.0

Sources:

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.

Examples

Section titled Examples

Invalid

Section titled Invalid
const foo = Math.pow(2, 8);
code-block.js:1:13 lint/style/useExponentiationOperator  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Use the ’**’ operator instead of ‘Math.pow’.
  
  > 1 │ const foo = Math.pow(2, 8);
      │             ^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use the ’**’ operator instead of ‘Math.pow’.
  
    1   │ - const·foo·=·Math.pow(2,·8);
      1 │ + const·foo·=·2·**·8;
    2 2 │   
  
const bar = Math.pow(a, b);
code-block.js:1:13 lint/style/useExponentiationOperator  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Use the ’**’ operator instead of ‘Math.pow’.
  
  > 1 │ const bar = Math.pow(a, b);
      │             ^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use the ’**’ operator instead of ‘Math.pow’.
  
    1   │ - const·bar·=·Math.pow(a,·b);
      1 │ + const·bar·=·a·**·b;
    2 2 │   
  
let baz = Math.pow(a + b, c + d);
code-block.js:1:11 lint/style/useExponentiationOperator  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Use the ’**’ operator instead of ‘Math.pow’.
  
  > 1 │ let baz = Math.pow(a + b, c + d);
      │           ^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use the ’**’ operator instead of ‘Math.pow’.
  
    1   │ - let·baz·=·Math.pow(a·+·b,·c·+·d);
      1 │ + let·baz·=·(a·+·b)·**·(c·+·d);
    2 2 │   
  
let quux = Math.pow(-1, n);
code-block.js:1:12 lint/style/useExponentiationOperator  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Use the ’**’ operator instead of ‘Math.pow’.
  
  > 1 │ let quux = Math.pow(-1, n);
      │            ^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use the ’**’ operator instead of ‘Math.pow’.
  
    1   │ - let·quux·=·Math.pow(-1,·n);
      1 │ + let·quux·=·(-1)·**·n;
    2 2 │

Valid

Section titled Valid
const foo = 2 ** 8;


const bar = a ** b;


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


let quux = (-1) ** n;
Section titled Related links