Iterables

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// A piece of text
"";

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// Create an array (list) of values
new Array(0, 0);

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// Get the number of items in an array
[].length;

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// Reverse the order of an array
[].reverse();

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// Join the items of an array into text
[].join(", ");

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// Check whether an array contains a value
[].includes(null);

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// Get a section of an array between two indexes
[].slice(0, 2);

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// Get the item at a given index of an array
[][0];

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// Get the position of a value within an array
[].indexOf(null);

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// Run code for each item in an array
for (const item of []) {
}