How does while loop work without a condition?

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I understand that it's removing the first 3 elements of the array and adding them to the new array. But how does the function continue to add ensuing chunks of the array to the new array variable?

How does the while loop work without proper conditions?

How does it work in collaboration with splice() here?

function chunkArrayInGroups(arr, size){
  let newArr = [];
  while(arr.length){
    newArr.push(arr.splice(0, size))
  }
  return newArr;
}

chunkArrayInGroups(["a", "b", "c", "d"], 2);

The condition is while(arr.length). The while loop will run while that condition is truthy. In JavaScript every condition is truthy unless it is one of the following:

false

0 (zero)

'' or "" (empty string)

null

undefined

NaN (e.g. the result of 1/0)

In your case the while loop will run while the array has elements in it (arr.length is greater than zero), because if the arr.length is zero the while loop will stop executing.

arr.splice on the other hand is removing one element from arr every time it is executed (it is changing the arr length). So when there are no elements left in the arr (because arr.splice removed them all) the while loop will stop.

Why is a while loop without a condition an error, whereas a for loop , The C-- Language Specification only permits empty parenthesized constructs [​code ]()[/code] for function definitions and invocations. This was a style choose,  The standard requires that the omitted condition for for loop is replaced by a non-zero constant: 1 The statement for ( clause-1 ; expression-2 ; expression-3 ) statement behaves as follows: The expression expression-2 is the controlling expression that is evaluated before each execution of the loop body.


Conditions in js are either "truthy" or "falsy", for numbers everything except 0 is "truthy", 0 is "falsy". That means that the loop runs until the array is empty, its length 0 and therefore falsy.

 if(0) alert("never");
 if(1) alert("always");
 let i = 3;
 while(i) console.log(i--);

Python "while" Loops (Indefinite Iteration) – Real Python, Let's see how Python's while statement is used to construct loops. Execution returns to the top of the loop, the condition is re-evaluated, and it is still true. same thing by putting those statements immediately after the while loop, without the else : Thus, while True: initiates an infinite loop that will theoretically run forever. In most computer programming languages, a do while loop is a control flow statement that executes a block of code at least once, and then repeatedly executes the block, or not, depending on a given boolean condition at the end of the block. The do while construct consists of a process symbol and a condition. First, the code within the block is executed, and then the condition is evaluated.


The while loop is gonna keep going until the original array is empty. Splice will remove the selected elements from the original array and while will continue until the last elements are removed.

Also, as the elements are removed from the original array, they are being pushed (added) to the new array

is while loop without condition possible while () { //body }, Yes, @aswathy, even if you have an infinite loop, like in "while(true){}" you can (​well, you *should*) have a break statement inside the while  I think while(true) is the best way to write an infinite loop. While(1) is a close second, because most people know that any non-zero value is true. A for loop without a condition I would regard as an error. Just because the compiler doesn't produce an error code does not mean that is acceptable coding style.


Loops: while and for, While the condition is truthy, the code from the loop body is executed. This form of syntax should only be used when you want the body of the loop to For example, 5 is a prime, because it cannot be divided without a  DO..WHILE - DO..WHILE loops are useful for things that want to loop at least once. Notice that the condition is tested at the end of the block instead of the beginning, so the block will be executed at least once. If the condition is true, we jump back to the beginning of the block and execute it again.


While loop without condition?, It means while True if there is no statement so its going to run until that condition is false "self.player.hit_points and (self.monster or  The do and while keyword is used to create a dowhile loop. It is similar to a while loop, however there is a major difference between them. In while loop, the condition is checked before the body is executed. It is the exact opposite in dowhile loop, i.e. condition is checked after the body is executed.


While loop, In most computer programming languages, a while loop is a control flow statement that allows Compare this with the do while loop, which tests the condition/expression after the first checks whether x is less than 5, which it is, so then the {loop body} is entered, where the printf function is run and x is incremented by 1. This is a while loop. while (is of age) { let person enter }. The condition is tested before the execute block. We're in a battle of the bands. We have to perform before the audience can rate us. This is a do/while loop. do {perform a song} while (the audience approves);. The condition is tested after at least once having executed the code block.