#Medium

deIdentification.js

// 去識別化
function deIdentification(str) {
  const showLen = Math.round(str.length / 2); // 顯示幾個
  const markLen = str.length - showLen; // 要隱藏幾個
  const showStart = Math.round((str.length - showLen) / 2)  ; // 從哪開始隱
  return str.replace(str.substr(showStart, markLen), '*'.repeat(markLen));
}

demo.md

deIdentification('a')

a

deIdentification('ab')

a*

deIdentification('abc')

a*c

deIdentification('abcd')

a**d

deIdentification('abcde')

a**de

deIdentification('abcdef')

ab***f

deIdentification('abcdefg')

ab***fg

deIdentification('abcdefgh')

ab****gh