freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/iterate-odd-numbers-with-a-for-loop.english.md

id, title, challengeType

id	title	challengeType
56104e9e514f539506016a5c	Iterate Odd Numbers With a For Loop	1

Description

For loops don't have to iterate one at a time. By changing our final-expression, we can count by even numbers. We'll start at i = 0 and loop while i < 10. We'll increment i by 2 each loop with i += 2.

var ourArray = [];
for (var i = 0; i < 10; i += 2) {
  ourArray.push(i);
}

ourArray will now contain [0,2,4,6,8]. Let's change our initialization so we can count by odd numbers.

Instructions

Push the odd numbers from 1 through 9 to myArray using a for loop.

Tests

tests:
  - text: You should be using a <code>for</code> loop for this.
    testString: 'assert(code.match(/for\s*\(/g).length > 1, "You should be using a <code>for</code> loop for this.");'
  - text: '<code>myArray</code> should equal <code>[1,3,5,7,9]</code>.'
    testString: 'assert.deepEqual(myArray, [1,3,5,7,9], "<code>myArray</code> should equal <code>[1,3,5,7,9]</code>.");'

Challenge Seed

// Example
var ourArray = [];

for (var i = 0; i < 10; i += 2) {
  ourArray.push(i);
}

// Setup
var myArray = [];

// Only change code below this line.

After Test

console.info('after the test');

Solution

var ourArray = [];
for (var i = 0; i < 10; i += 2) {
  ourArray.push(i);
}
var myArray = [];
for (var i = 1; i < 10; i += 2) {
  myArray.push(i);
}