1.

What is strict mode? What are some of the advantages and disadvantages of using it?

Answer»

With the help of “Strict Mode,” users can write SECURE Javascripts easily. It changes bad syntax into real errors. It can be DECLARED by placing “use strict”; at the beginning of a function or script.

Advantages
  • It eliminates some JavaScript errors by changing them to throw errors.
  • Strict Mode prevents errors when some UNSAFE actions are taken.
Disadvantages
  • If a library that was in strict mode but by mistake used in normal mode then that might CALL some actions and wouldn’t work as expected.
  • One of the MAJOR disadvantages of using this mode is error might fail silently.
Example

<script>
"use strict";
show();

function show() {
  y = 3.14;
}
</script>


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