Convert a string to an sha256 hash in JavaScript

sha256.js

/**
 * Convert a string to an sha256 hash
 * @param str {string}
 * @returns {string}
 */
async function sha256(str) {
  const arrayBuffer = new TextEncoder("utf-8").encode(str)
  const hashAsArrayBuffer = await crypto.subtle.digest('SHA-256', arrayBuffer);
  const uint8ViewOfHash = new Uint8Array(hashAsArrayBuffer);
  return Array.from(uint8ViewOfHash).map((b) => b.toString(16).padStart(2, '0')).join('');
}

Test

(async () => {
  {
    const assertion = 'Will return the same hash for the same value'
    const hash1 = await sha256('foobar')
    const hash2 = await sha256('foobar')
    console.assert(hash1 === hash2, assertion)
  }
  {
    const assertion = 'Will return the different hashes for the different values'
    const hash1 = await sha256('foobar2')
    const hash2 = await sha256('foobar')
    console.assert(hash1 !== hash2, assertion)
  }
})()