parseFloat() from the middle of the string

Question

I always have a "NaN" when wanted to "parseInt or parseFloat" from string like "Sometext 330"

Var a = "Sometext 330"
return parseFloat(a);

and it will return "NaN" but i need integer or float 330

Answer 1

You could sanitize your string first so only digit's remain in the string before parsing the number.

edit: now it's even safer as it will accept Number types without blowing up.

var a = "Sometext 330"

function safeParseFloat(val) {
  return parseFloat(isNaN(val) ? val.replace(/[^\d\.]+/g, '') : val)
}

function superSafeParseFloat(val) {
  if (isNaN(val)) {
    if ((val = val.match(/([0-9\.,]+\d)/g))) {
      val = val[0].replace(/[^\d\.]+/g, '')
    }
  }
  return parseFloat(val)
}

console.log(
  safeParseFloat(a),
  safeParseFloat(2000.69)
)

console.log(
  superSafeParseFloat('blah $2,000,000.69 AUD'),
  superSafeParseFloat('blah $8008 USD'),
  superSafeParseFloat('NotANumber'),
  superSafeParseFloat(8008.69),
  superSafeParseFloat('... something 500.5... test')
)