Useful JS snippets

utils.js

// guid-> 9b06304f-e10f-4363-8257-eca66e58e559
export default function guid() {
  let s = [];
  let hexDigits = '0123456789abcdef';
  for (var i = 0; i < 36; i++) {
    s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
  }
  s[14] = '4';  // bits 12-15 of the time_hi_and_version field to 0010
  s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1);  // bits 6-7 of the clock_seq_hi_and_reserved to 01
  s[8] = s[13] = s[18] = s[23] = '-';

  var uuid = s.join('');
  return uuid;
}

// expand(111)-> 100+10+1
export default function expand(num) {
	let arr = num.toString().split('');
	let result = arr.map((n, i) => Number(n) * Math.pow(10, arr.length - i -1)).filter(n => n > 0);
	return result.join(' + ');
}
// json loop read K,V
export default function json_k_v(data) {
	data.forEach(obj => {
		Object.entries(obj).forEach(([k, v]) => {
			console.log(`${k} ${v}`)
		})
		console.log('======================')
	})
}