CODEWITHSUNDEEP
javascripttype-conversionparseint
J. Sutliff
J. Sutliff

Reputation: 1

How to convert string representing a decimal using parseInt instead of parseFloat?

Given a string that represents a number use parseInt to convert string to number. I wrote a working function, but did not account for decimal numbers. Is there a way to convert decimals using parseInt? This is as far as I've gotten trying to account for decimals. The problem with this is NaN being returned. I can't think of a solution to implement that filters NaN from the results. The ultimate goal is to compare the two strings. My solution must use parseInt. 

function convertStr(str1, str2) {
let num1 = str1.split('')
let num2 = str2.split('');
num1 = num1.map(str => parseInt(str));
num2 = num2.map(str => parseInt(str));
console.log(num1);
console.log(num2);
}

Any help is greatly appreciated.

Upvotes: 0

Views: 92

Answers (1)

Orelsanpls
Orelsanpls

Reputation: 23505

I think this is a good step to what you are seeking for :

The question is : What do you want as output when encountering decimal value?

// Soluce to replace NaN by '.'
function convertStrReplace(str1) {
  let num1 = str1.split('')
  
  num1 = num1.map(str => parseInt(str)).map(x => isNaN(x) ? '.' : x);
  
  console.log(num1);
}

// Soluce to ignore NaN
function convertStrIgnore(str1) {
  let num1 = str1.split('')
  
  num1 = num1.map(str => parseInt(str)).filter(x => !isNaN(x));
  
  console.log(num1);
}


convertStrReplace('17,52');
convertStrIgnore('17,52');

Syntax alternative

function convertStrFilter(str1) {
  const num1 = [
    ...str1,
  ].map(str => parseInt(str)).filter(x => !isNaN(x));

  console.log(num1);
}

convertStrFilter('17,52');

Explaination about integer and string differences

// String and integer differences

// Put a number into a string
const str = '9000';

console.log(typeof str, str);

// Put a number into a number
const number = 9000;

console.log(typeof number, number);

// Compare both (compare value and type)
console.log('equality ===', str === number);

// Compare both (compare value)
console.log('equality ==', str == number);

const numberFromString = parseInt(str);

console.log(typeof numberFromString, numberFromString);

// Compare both (compare value and type)
console.log('equality ===', number === numberFromString);

Upvotes: 2

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