“use strict” is a feature of JavaScript that tells the compiler to use a strict context. For example, consider the code below. This code produces no errors, and displays “1” in the console:
"use strict"; try { var i = 1; console.log(i); } catch(e) { console.error(e); }
However, let’s say we didn’t include “var” before our variable. In normal JavaScript without using “use strict”, this would be fine. However, with “use strict”, it throws an error:
"use strict"; try { i = 1; console.log(i); } catch(e) { console.error(e); }
For more information: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode
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