Daily Challenge #163 - Significant Figures

import strutils

proc significantFigures(n: float): int = formatFloat(n)
  .replace(".")
  .strip(chars={'0'})
  .len()

when isMainModule:
  assert significantFigures(1) == 1
  assert significantFigures(003) == 1
  assert significantFigures(3000) == 1
  assert significantFigures(404) == 3
  assert significantFigures(050030210) == 7
  assert significantFigures(0.1) == 1
  assert significantFigures(0.0) == 0

def sigfig(num):
  # ignore 0's on the far left
  ldx = 0
  while num[ldx] == '0' and ldx < len(num):
    ldx += 1

  # ignore 0's on the far right if no decimal place
  rdx = len(num) - 1
  if num.find('.') > 0:
    return (rdx - ldx) # the +1 from below is cancelled out by needing to subtract the '.'
  else:
    while num[rdx] == '0' and rdx > -1:
      rdx -= 1
    return (rdx - ldx) + 1

print(sigfig('11'), 2)
print(sigfig('1.1'), 2)
print(sigfig('1'), 1)
print(sigfig('003'), 1)
print(sigfig('3000'), 1)
print(sigfig('404'), 3)
print(sigfig('050030210'), 7)
print(sigfig('0.1'), 1)
print(sigfig('0.0'), 1)

const significant = str => str.includes('.')
   ? str.replace(/^0+/, '').length - 1
   : str.replace(/^0+|0+$/g, '').length

function get_significant_num(str) {
  var total_significant_nums = 0;

  if (typeof str === 'string') {

    str = str.trim().replace(/^(0)+/, '');

    if (/\./.test(str)) {
      total_significant_nums = str.match(/\d+/g).join('').length;
    } else {
      str = str.replace(/0+$/, '');
      total_significant_nums = str.length;
    }

  }

  return total_significant_nums;
}


console.log(get_significant_num('20.0'));//3
console.log(get_significant_num('78.200'));//5
console.log(get_significant_num('0.6'));//1
console.log(get_significant_num('0215'));//3
console.log(get_significant_num('4.357'));//4
console.log(get_significant_num('345000'));//3
console.log(get_significant_num('050030210'));//7