如何拆分字符串，转换为数字和总和

Question

I have a function that I have modified to get a string (which consists of zeros and ones only). The string ( timesheetcoldata ):

100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000

The string items (the numbers one and zero) will change every time the function is run. It will always be the same length. I have made the string above easier to see what I am trying to achieve.

I want to return the first character and then every 24th character (as in the variable colsCount in the function). so, in the example above, it would return something like: 111111

I then want to convert these characters to numbers (something like [1, 1, 1, 1, 1, 1] ).

I then want to sum these number together (so it would return, in the example: 6 ).

I then want to check if the returned number matches the variable: rowsCount or true if it does, false if it does not.

My function:

$("#J_timingSubmit").click(function(ev){

  var sheetStates = sheet.getSheetStates();
  var rowsCount = 6;
  var colsCount = 24;
  var timesheetrowsdata = "";
  var timesheetcoldata = "";

  for(var row= 0, rowStates=[]; row<rowsCount; ++row){
    rowStates = sheetStates[row];
    timesheetrowsdata += rowStates+(row==rowsCount-1?'':',');
  }

  timesheetcoldata = timesheetrowsdata.replace(/,/g, '');
  console.log(timesheetcoldata);
});

Thank you very much to both Rajesh and MauriceNino (and all other contributers).

With their code I was able to come up with the following working function:

$("#J_timingSubmit").click(function(ev){

  var sheetStates = sheet.getSheetStates();
  var rowsCount = 6;
  var timesheetrowsdata = "";
  var timesheetcoldata = "";

  for(var row= 0, rowStates=[]; row<rowsCount; ++row){
    rowStates = sheetStates[row];
    timesheetrowsdata += rowStates+(row==rowsCount-1?'':',');
  }

  timesheetcoldata = timesheetrowsdata.replace(/,/g, '');

var count = 0;
var list = [];
for(var i = 0; i< timesheetcoldata.length; i+=24) {
  const num1 = Number(timesheetcoldata.charAt(i));
  list.push(num1);
  count += num1;
}

let isSameAsRowsCount = count == rowsCount;
console.log('Is Same? ', isSameAsRowsCount);

});

Answer 1

You can always rely on traditional for for such action. Using functional operations can be more readable but will be more time consuming( though not by much ).

You can try this simple algo:

1. Create a list that will hold all numbers and a count variable to hold sum.
2. Loop over string. As string is fixed, you can set the increment factor to the count( 24 ).
3. Convert the character at given index and save it in a variable.
4. Push this variable in list and also compute sum at every interval.

At the end of this loop, you have both values.

 var string = '100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000'; var count = 0; var list = []; for(var i = 0; i< string.length; i+=24) { const num1 = Number(string.charAt(i)); list.push(num1); count += num1; } console.log(list, count) 

Answer 2

Here is a step by step explanation, on what to do.

• Use match() to get every nth char
• Use map() to convert your array elements
• Use reduce() to sum your array elements

Everything needed to say is included in code comments:

 const testData = '100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000'; // Step 1) Create array of numbers from string const dataArr = testData.match(/.{1,24}/g) // Split on every 24th char .map(s => Number(s[0])) // Only take the first char as a Number console.log(dataArr); // Step 2) Sum array Numbers let dataSum = dataArr.reduce((a, b) => a + b); // Add up all numbers console.log(dataSum); // Step 3) Compare your variables let rowsCount = 123; // Your Test variable let isSameAsRowsCount = dataSum == rowsCount; console.log('Is Same? ', isSameAsRowsCount); 

Answer 3

As @Jaromanda mentioned, you can use the following to done this.

 const string = '100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000100000000000000000000000'; const value = string.split('').filter((e,i)=> !(i%24)).reduce((acc,cur)=> acc+ (+cur), 0); console.log(value);