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Created December 4, 2016 00:12
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Undefined, Null, NaN, Infinity Und, Nu, NaN, Inf studies // source https://jsbin.com/jimiku
Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta name="description" content="Und, Nu, NaN, Inf studies">
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Undefined, Null, NaN, Infinity</title>
</head>
<body>
<script id="jsbin-javascript">
// -----Undefined, Null, NaN, Infinity, -Infinity----- //
/* Undefined and null are both special values that signify the absence of meaningful
data. Undefined is considered its own data type, but null is considered an object by Javascript,
which can be misleading. Null, more specifically, should represent the nonexistence of
something. */
"use strict";
console.log(typeof undefined);
/* NaN stands for "not a number," and represents instances of calculations that do
not result in a precise or meaningful answer: */
console.log(1 * "what are you doing?"); // this is nonsensical
/* Using the typeof method on NaN will return "number", though it is not. */
/* Two other values that are grouped into the "number" type are the keywords Infinity and
(-Infinity)--the former representing infinity into the positive integers and the latter
into the negative integers. It is best not to trust infinity-based calculations, as they
will often lead to NaN. */
console.log(typeof -Infinity);
</script>
<script id="jsbin-source-javascript" type="text/javascript">// -----Undefined, Null, NaN, Infinity, -Infinity----- //
/* Undefined and null are both special values that signify the absence of meaningful
data. Undefined is considered its own data type, but null is considered an object by Javascript,
which can be misleading. Null, more specifically, should represent the nonexistence of
something. */
console.log(typeof undefined)
/* NaN stands for "not a number," and represents instances of calculations that do
not result in a precise or meaningful answer: */
console.log(1 * "what are you doing?"); // this is nonsensical
/* Using the typeof method on NaN will return "number", though it is not. */
/* Two other values that are grouped into the "number" type are the keywords Infinity and
(-Infinity)--the former representing infinity into the positive integers and the latter
into the negative integers. It is best not to trust infinity-based calculations, as they
will often lead to NaN. */
console.log(typeof -Infinity);</script></body>
</html>
Raw
jsbin.jimiku.js
// -----Undefined, Null, NaN, Infinity, -Infinity----- //
/* Undefined and null are both special values that signify the absence of meaningful
data. Undefined is considered its own data type, but null is considered an object by Javascript,
which can be misleading. Null, more specifically, should represent the nonexistence of
something. */
"use strict";
console.log(typeof undefined);
/* NaN stands for "not a number," and represents instances of calculations that do
not result in a precise or meaningful answer: */
console.log(1 * "what are you doing?"); // this is nonsensical
/* Using the typeof method on NaN will return "number", though it is not. */
/* Two other values that are grouped into the "number" type are the keywords Infinity and
(-Infinity)--the former representing infinity into the positive integers and the latter
into the negative integers. It is best not to trust infinity-based calculations, as they
will often lead to NaN. */
console.log(typeof -Infinity);
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