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noApproximativeNumericConstant (since v1.3.0)

Diagnostic Category: lint/suspicious/noApproximativeNumericConstant

Sources:

Use standard constants instead of approximated literals.

Usually, the definition in the standard library is more precise than what people come up with or the used constant exceeds the maximum precision of the number type.

Examples

Section titled Examples

Invalid

Section titled Invalid
let x = 3.141;
suspicious/noApproximativeNumericConstant.js:1:9 lint/suspicious/noApproximativeNumericConstant  FIXABLE  ━━━━━━━━━━

  ✖ Prefer constants from the standard library.
  
  > 1 │ let x = 3.141;
      │         ^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use Math.PI instead.
  
    1   │ - let·x·=·3.141;
      1 │ + let·x·=·Math.PI;
    2 2 │   
  

let x = 2.302;
suspicious/noApproximativeNumericConstant.js:1:9 lint/suspicious/noApproximativeNumericConstant  FIXABLE  ━━━━━━━━━━

  ✖ Prefer constants from the standard library.
  
  > 1 │ let x = 2.302;
      │         ^^^^^
    2 │ 
  
  ℹ Unsafe fix: Use Math.LN10 instead.
  
    1   │ - let·x·=·2.302;
      1 │ + let·x·=·Math.LN10;
    2 2 │

Valid

Section titled Valid
let x = Math.PI;
let y = 3.14;
let x = Math.LN10;
Section titled Related links