CODEWITHSUNDEEP
javascriptnode.jswhile-loopiteration
user7069368
user7069368

Reputation:

Return to while loop, after iteration - when condition is true again?

I am wondering if it's possible to go back to a while loop instead of having to type it all over again?

Simple example:

let sum = 0;
let value = 10;

while (sum < value) {
    // do code
    sum++;
};

// sum is changed for some reason outside of loop, after iteration
sum = 3

// iterate through the loop again?

Instead of..

let sum = 0;  
let value = 10;

while (sum < value) {
    // do code
    sum++;
};

// sum is changed for some reason outside of loop, after iteration
sum = 3;

while (sum < value) {
  // do same code again
  sum++;
};

I suppose you can create a function with the while-loop but is it possible to handle this some other way?

Thanks in advance.

Upvotes: 0

Views: 387

Answers (4)

Nina Scholz
Nina Scholz

Reputation: 386560

You could take the values in an array and loop the array and the while loop inside of the for loop.

var sums = [0, 3],
    sum,
    value = 10,
    i;

for (i = 0; i < sums.length; i++) {
    sum = sums[i];
    console.log('outer', sum);
    while (sum < value) {
        // do code
        sum++;
        console.log('inner', sum);
    }
}
.as-console-wrapper { max-height: 100% !important; top: 0; }

Upvotes: 0

Christian Vincenzo Traina
Christian Vincenzo Traina

Reputation: 10384

If you are in a ES6 environment you can use a setter to watch an object and execute a function when one of its property changes.

let obj = {
  value: 20,
  set sum(sum) { 
    while (sum < this.value) {
      // some code
      sum++;
    }
  }
};

obj.sum = 5; // execute the code inside the while 15 times
obj.sum = 10; // execute the code other 10 times

You can also give a glance to Proxies

Upvotes: 0

Salman
Salman

Reputation: 333

Functions are one of the fundamental building blocks in JavaScript. A function is a JavaScript procedure—a set of statements that performs a task or calculates a value. To use a function, you must define it somewhere in the scope from which you wish to call it.

let sum = 0;  
let value = 10;
valueSum(sum , value);
sum = 3;
valueSum(sum , value);


function valueSum(sum , Value){
while (sum < value) {
    // do code
    sum++;
};

}

Upvotes: 0

Nick
Nick

Reputation: 16576

Make loopy function. Functions help avoid duplicating code.

let sum = 0;  
let value = 10;

function loopy() {
  while (sum < value) {
      // do code
      console.log(sum++)
  };
}

loopy();

// sum is changed for some reason outside of loop, after iteration
sum = 3;

loopy();

Upvotes: 1

Related Questions