Well, I’m not much of a python programmer, but I’d say that the answer is ‘YES’. Any dynamic language that lets you create a variable with any name at any time, could use a ‘strict’ pragma. Strict vars (one of the options for strict in Perl, ‘use strict’ turns them all on at once) in … Read more
As it has already been mentioned for Babel 6, it’s the transform-es2015-modules-commonjs preset which adds strict mode. In case you want to use the whole es2015 preset without module transformations, put this in your .babelrc file: { “presets”: [ [“es2015”, { “modules”: false }] ] } This will disable modules and strict mode, while keeping … Read more
For what it’s worth, I agree with the comments above. For whatever problem you’re trying to solve, there are usually better solutions. However, just for illustrative purposes, here’s one (very ugly) solution: ‘use strict’ function jamie (){ var callerName; try { throw new Error(); } catch (e) { var re = /(\w+)@|at (\w+) \(/g, st … Read more
There are a zillion benefits to strict mode, but since you asked specifically about performance, not just the good coding benefits, here’s what MDN says about that: Strict mode makes several changes to normal JavaScript semantics. First, strict mode eliminates some JavaScript silent errors by changing them to throw errors. Second, strict mode fixes mistakes … Read more
It’s because, until ECMAscript 262 edition 5, there was a big confusion if people who where using the constructor pattern, forgot to use the new keyword. If you forgot to use new when calling a constructor function in ES3, this referenced the global object (window in a browser) and you would clobber the global object … Read more
“use strict”; Basically it enables the strict mode. Strict Mode is a feature that allows you to place a program, or a function, in a “strict” operating context. In strict operating context, the method form binds this to the objects as before. The function form binds this to undefined, not the global set objects. As … Read more