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Understand String Immutability

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Abhisek Pattnaik
2015-12-25 16:29:13 +05:30
committed by SaintPeter
parent 28b1f99deb
commit 95d7c25679
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seed/challenges/01-front-end-development-certification/basic-javascript.json
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@ -1188,10 +1188,11 @@
"id": "56533eb9ac21ba0edf2244ba",
"title": "Understand String Immutability",
"description": [
"In Javascript, strings are <dfn>immutable</dfn>, which means that they cannot be changed or modified once created. For example, this code:",
"<code>var myStr = \"Bob\";<br />myStr[0] = \"J\";</code>",
"will not change the contents of <code>myStr</code> to \"Job\", because the contents of myStr cannot be altered. Note that this does <em>not</em> mean that <code>myStr</code> cannot be change, just that individual characters cannot be changes. The only way to change <code>myStr</code> would be to overwrite the contents with a new string, like this:",
"<code>var myStr = \"Bob\";<br />myStr = \"Job\";</code>",
"In Javascript, <code>String</code> values are <dfn>immutable</dfn>, which means that they cannot be altered once created.",
"For example, the following code:",
"<blockquote><code>var myStr = \"Bob\";<br>myStr[0] = \"J\";</code></blockquote>",
"cannot change the value of <code>myStr</code> to \"Job\", because the contents of myStr cannot be altered. Note that this does <em>not</em> mean that <code>myStr</code> cannot be changed, just that the individual characters of a <dfn>string literal</dfn> cannot be changed. The only way to change <code>myStr</code> would be to assign it with a new string, like this:",
"<blockquote><code>var myStr = \"Bob\";<br>myStr = \"Job\";</code></blockquote>",
"<h4>Instructions</h4>",
"Correct the assignment to <code>myStr</code> to achieve the desired effect."
],