format string to another string format javascript-CodePudding

I have the following function:

export const getFormatValue = (raw, value) => {
  let maskIndex = 0;
  let formattedValue = '';

  raw.split('').forEach(char => {
    if (value.length > maskIndex && value[maskIndex] === ' ') {
      formattedValue  = ' ';
      maskIndex  = 1;
    }
    formattedValue  = char;
    maskIndex  = 1;
  });

  return formattedValue;
};

It fails the following test cases

Expected: "A   BB   CCC"
Received: "A B BC C C"


> 11 |     expect(getFormatValue('ABBCCC', 'A   AA   AAA')).toBe('A   BB   CCC');

My code works for simple cases such as:

expect(getFormatValue('23', '0 0000 0000 0000')).toBe('2 3');

But soon as the "mask" pattern gets more complicated it fails.

The "mask" value is dynamic

CodePudding user response：

You can reverse the string to be formatted, and then you can use the function Array.prototype.reduce and check the char in the pattern.

function getFormatValue(str, pattern) {
  const reversed = str.split("").reverse();
  return pattern.split("").reduce((a, c) => [...a, c === " " ? c : reversed.pop()], []).join("");
}

console.log(getFormatValue('ABBCCC', 'A   AA   AAA'));

CodePudding user response：

One simple way of doing this:

export const getFormatValue = (raw, value) => {
   raw = raw.split('');
   return value.replace(/[^\s]/g, () => {
      return raw.shift() || '';
   });
}