I’m using ReactJS and when a user clicks a link I want to copy some text to the clipboard. I am using Chrome 52 and I do not need to support any other browsers. I can’t see why this code does not result in the data being copied to the clipboard. (the origin of the … Read more
Edit: I don’t want to call handleChange only if the button has been clicked. It has nothing to do with handleClick. I gave an example in the @shubhakhatri answer’s comment. I want to change the input value according to state, the value is changing but it doesn’t trigger handleChange() method. How can I trigger handleChange() method ? Here is the … Read more
In JavaScript you can use template literals:
Node 13+ Since Node 13, you can use either the .mjs extension, or set {“type”: “module”} in your package.json. You don’t need to use the –experimental-modules flag. Modules is now marked as stable in node.js Node 12 Since Node 12, you can use either the .mjs extension, or set “type”: “module” in your package.json. And you need to run node with the –experimental-modules flag. Node 9 In Node 9, it is enabled behind a flag, and … Read more
I see a number of questions on here relating to this same issue, but it seems none match the issue I’m having, and are a bit more complex. I am in the process of learning ReactJS and React Native. I’m in the midst of reading and following the code examples from “Learning React Native” book … Read more
It does 5 things: It creates a new object. The type of this object is simply object. It sets this new object’s internal, inaccessible, [[prototype]] (i.e. __proto__) property to be the constructor function’s external, accessible, prototype object (every function object automatically has a prototype property). It makes the this variable point to the newly created object. It executes the constructor function, using the newly created … Read more
You are not passing the variable correctly. One fast solution is to make a global variable like this:
like this: Actually, even though I typically do it like this for simple convenience, over 1,000s of iterations it appears for raw speed there is an advantage for .toString() See Performance tests here (not by me, but found when I went to write my own): http://jsben.ch/#/ghQYR Fastest based on the JSPerf test above: str = num.toString(); It should be … Read more
See the documentation on MDN about expressions and operators and statements. Basic keywords and general expressions this keyword: How does the “this” keyword work? var x = function() vs. function x() — Function declaration syntax var functionName = function() {} vs function functionName() {} (function(){…})() — IIFE (Immediately Invoked Function Expression) What is the purpose?, How is it called? Why does (function(){…})(); work but function(){…}(); doesn’t? (function(){…})(); vs (function(){…}()); shorter alternatives: !function(){…}(); – What … Read more
Recommended (reduce with default value) Array.prototype.reduce can be used to iterate through the array, adding the current element value to the sum of the previous element values. Run code snippetExpand snippet Without default value You get a TypeError Run code snippetExpand snippet Prior to ES6’s arrow functions Run code snippetExpand snippet Non-number inputs If non-numbers are … Read more