Hardfork.lte

Check if hardfork is less than or equal to target

Try it Live

Run Hardfork examples in the interactive playground

Operator-Style API

lte mimics the ≤ operator for clearer code:

import { LONDON, CANCUN } from 'tevm'

// Operator-style (reads like <= operator)
if (LONDON.lte(CANCUN)) {
  // ...
}

// Equivalent using isBefore + equals
if (Hardfork.isBefore(LONDON, CANCUN) || Hardfork.equals(LONDON, CANCUN)) {
  // ...
}

Usage Patterns

Maximum Version Checks

import { Hardfork, CANCUN } from 'tevm'

function validateMaxVersion(fork: BrandedHardfork) {
  if (!fork.lte(CANCUN)) {
    throw new Error(`Unsupported hardfork beyond Cancun: ${Hardfork.toString(fork)}`)
  }
}

Range Validation

import { Hardfork, BERLIN, SHANGHAI } from 'tevm'

function isInSupportedRange(fork: BrandedHardfork): boolean {
  return fork.gte(BERLIN) && fork.lte(SHANGHAI)
}

// Check if fork is between Berlin and Shanghai (inclusive)
isInSupportedRange(LONDON)  // true

Network Configuration

import { Hardfork, PRAGUE } from 'tevm'

function checkTestnetSupport(fork: BrandedHardfork) {
  if (fork.lte(PRAGUE)) {
    return "Fully supported"
  }
  return "Experimental - use with caution"
}

Chronological Ordering

Uses chronological deployment order:

BERLIN (10) < LONDON (11) < MERGE (14) < SHANGHAI (15) < CANCUN (16)

Comparison with isBefore

Unlike isBefore, lte returns true for equal versions:

import { LONDON } from 'tevm'

LONDON.lte(LONDON)       // true - equal counts
LONDON.isBefore(LONDON)  // false - strictly less than

Performance

Time Complexity: O(1) - Array index comparison

Typical Time: ~10-20ns per call

See Also

• gte - Greater than or equal
• lt - Strictly less than (alias for isBefore)
• isBefore - Strictly less than