Strict mode makes it easier to write "secure" JavaScript. Strict mode changes previously accepted "bad syntax" into real errors. In normal JavaScript, mistyping a variable name creates a new global variable. In strict mode, this will throw an error, making it impossible to accidentally create a global variable.
The directive looks like a string, "use strict" or 'use strict'. It is either located at the topmost of a script or the top of a function.
'use Strict';
If we have any code before this then strict mode will not be activated. We can use strict mode even for specific functions.
'use strict';
// This will throw an error cause interface is a reserved word
const interface = 'audio';
// This will throw an error cause we haven't declared x in anywhere
x = 43;
Error Message :
It usually throws an error when we make any mistake ie: using reserved words, using variables that we never declared in our code.
Conclusion
It is a good practice to " use strict " mode at the top of a program (script) or the top of a function. In future articles, the line "use strict" will be skipped.
Hope you guys understood the above strict mode 🙌🏼
What is your thought about strict mode ? Comment it below 👨🏻💻
