Style-ExponentialNotation.md

Pattern: Inconsistent exponential notation

Issue: -

Description

This rule enforces consistency when using exponential notation for numbers in the code (eg 1.2e4). Different styles are supported:

• scientific which enforces a mantissa between 1 (inclusive) and 10 (exclusive).
• engineering which enforces the exponent to be a multiple of 3 and the mantissa to be between 0.1 (inclusive) and 10 (exclusive).
• integral which enforces the mantissa to always be a whole number without trailing zeroes.

Examples

EnforcedStyle: scientific (default)

# Enforces a mantissa between 1 (inclusive) and 10 (exclusive).

# bad
10e6
0.3e4
11.7e5
3.14e0

# good
1e7
3e3
1.17e6
3.14

EnforcedStyle: integral

# Enforces the mantissa to have no decimal part and no
# trailing zeroes.

# bad
3.2e7
0.1e5
120e4

# good
32e6
1e4
12e5

Further Reading

• RuboCop - Style/ExponentialNotation