How to count number in a string using .match in JS)-CodePudding

could you please help me to solve this problem using .match regex? I dont know how to count numbers in this string. After I use match, I get an array and I cant plus those numbers together.

function func() {
  let count = 0;
  const text = "hi 3 how 10 are you 44"
  const regex = /\d /g; 
  const matches = text.match(regex); 

  if (count === 57) {
    return 'yes';
  }
}
func();

CodePudding user response：

Javascript Array method reduce is what you're looking for.

Here's a modified version of your function that will return the sum of numbers matches by your regex.

function func() {
  let count = 0;
  const text = "hi 3 how 10 are you 44"
  const regex = /\d /g;
  const matches = text.match(regex);

  if (!matches) return count; // no matches, return zero

  count = matches.reduce( // iterate over matches Array, passing through reduce function
    (acc, curr) => acc   parseInt(curr), // reduce values, sum matched numbers
    0 // initial value
  )

  return count
}

const someCondition = func();

if (someCondition === 57) {
  console.log('yes')
}

My next suggestion would be to pass text as a argument to the function func followed by renaming the function to something better, such as sumNumbersInString.

CodePudding user response：

Regex match returns an array, so just grab the length.

function func() {
    let string = 'hi 3 how 10 are you 44';
    let count = (string.match(/\d /g) || []).length;
    console.log(count);
    return count;
}
func()