'Use Strict' in JavaScript | Part-6 | Secure JavaScript Programming смотреть онлайн

Here we learn, What is 'use Strict' mode in JavaScript, how and Whys to use 'Use Strict' in JavaScript with examples.

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What is “Use Strict” in JavaScript?
“use strict” keyword, instruct to run JavaScript program in strict mode.
For examples, undeclared variable, mistyped variables thrown errors while running JavaScript Program.
Such types of code will not be allowed as allowed in without using ‘use strict’ directive.

The “use strict” directive was introduced in ECMAScript version 5.
It is not a statement, It is literal expression, It must write on top of program.
All modern browser support “use strict” as well as all old version of browser.

Benefits of using “use strict” :
You can use strict mode in all your program.
It helps to write cleaner and avoid any runtime errors due to unhandled code.
It helps to write secure JavaScript programs.
for an examples: Any mistyped variable name creates a new global variable in normal JavaScript but with strict mode ,it will throw an error for the same.

Should I use strict mode JavaScript?
Is use strict necessary?
What is strict mode?
Is react in strict mode?
When would you not use strict mode?
What is the correct way to run JavaScript in strict mode?
Why this is undefined in strict mode?