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Midnight.js API Reference v1.0.0

Midnight.js API Reference / @midnight-ntwrk/midnight-js-utils / assertIsHex

Function: assertIsHex()

assertIsHex(source, byteLen?): asserts source is string

Asserts that a string represents a hex-encoded sequence of bytes.

Parameters​

source​

string

The source string.

byteLen?​

number

An optional number of bytes that source should represent. If not specified then any number of bytes can be represented by source.

Returns​

asserts source is string

Throws​

Error byteLen is <= zero. Valid hex-strings will be required to have at least one byte.

Throws​

TypeError source is not a hex-encoded string because it:

  • is empty,
  • contains invalid or incomplete characters, or
  • does not represent byteLen bytes.