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* Add logger as a util

* Add logger

* Update flow checks

2017-11-23 19:37:02 +01:00

hex

Internal utilities to create and test for hex values

hexAddPrefix

Adds the 0x prefix to string values.

hexAddPrefix (value: ?string): string

Returns a 0x prefixed string from the input value. If the input is already prefixed, it is returned unchanged.

import { hexAddPrefix } from '@polkadot/util';

console.log('With prefix', hexAddPrefix('0a0b12')) // => 0x0a0b12

Tests for the existence of a 0x prefix.

hexHasPrefix (value: ?string): boolean

Checks for a valid hex input value and if the start matched 0x

import { hexHasPrefix } from '@polkadot/util';

console.log('has prefix', hexHasPrefix('0x1234')); // => true

Strips any leading 0x prefix.

hexStripPrefix (value: ?string): string

Tests for the existence of a 0x prefix, and returns the value without the prefix. Un-prefixed values are returned as-is.

import { hexStripPrefix } from '@polkadot/util';

console.log('stripped', hexStripPrefix('0x1234')); // => 1234