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2026-03-09 10:47 Diff
https://htmlacademy.org/courses/javascript-programming/loops/summary-1

Loop for

Syntax

for (var i = 0; i < 10; i++) { // repeated commands }

var i = 0; preparatory part, the initial value for the counter. Set with var, as an ordinary variable.

i < 10; checking part. If the condition returns true, the loop completes one more iteration, otherwise the loop stops.

i++ complementary part, launched at each iteration, after executing the code from the body of the loop. Changes counter value.

Accumulation of values ​​in a loop:

var sum = 0; for (var i = 1; i <= 5; i++) { sum += 2; console.log(sum); }

The program will log:

LOG: 2 (number) LOG: 4 (number) LOG: 6 (number) LOG: 8 (number) LOG: 10 (number)

Checks in the loop body

var sum = 0; for (var i = 1; i <= 5; i++) { if (i > 2) { sum += 1; } }

Searching for an even number

The % operator or the “remainder in division” returns the remainder in division.

10 % 5; // Returns 0 12 % 5; // Returns 2 7 % 3; // Returns 1 5.5 % 2; // Returns 1.5

If the remainder in division of the number by 2 equals 0, the number is even, otherwise it is odd.


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