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  1. Basic math in JavaScript — numbers and operator...

    In this article, we have covered the fundamental information you need to know about numbers in JavaScript, for now. You'll see numbers used again and again, all the way through your JavaScript learning, so it's a good idea to get this out of the way now. If you are one of those people that doesn't enjoy math, you can take comfort in the fact that this chapter was pretty short....that everything is in order: js const myInt = 5; const myFloat...the below two lines as shown: js typeof myInt; typeof myFloat;...

    developer.mozilla.org/en-US/docs/Learn/JavaScri...
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  2. SyntaxError: numbers out of order in {} quantif...

    The JavaScript exception "numbers out of order in {} quantifier" occurs when a quantifier in a regular expression uses the {n,m} syntax but m is less than n....Invalid examples js /1{2,1}/; Valid examples js /1{1,2}/; See also...

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  3. RangeError: repeat count must be non-negative -...

    The JavaScript exception "repeat count must be non-negative" occurs when the String.prototype.repeat() method is used with a count argument that is a negative number....cases js "abc".repeat(-1); // RangeError Valid cases js "abc"...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  4. GamepadEvent - Web APIs | MDN

    Learn about the GamepadEvent interface, including its constructor and properties, code examples, specifications, and browser compatibility.... js window.addEventListener("gamepadconnected"...a gamepaddisconnected event. js window.addEventListener("gamepaddisconnected"...

    developer.mozilla.org/en-US/docs/Web/API/Gamepa...
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  5. SyntaxError: await/yield expression can't be us...

    The JavaScript exception "await expression can't be used in parameter" or "yield expression can't be used in parameter" occurs when the default parameter expression contains the await or yield keyword and has the effect of pausing default parameter evaluation.... Examples Invalid cases js function *gen(a = yield 1) {}...would need to use a condition. js function* gen(a) { a ??= yield...

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  6. First-class Function - MDN Web Docs Glossary: D...

    A programming language is said to have First-class functions when functions in that language are treated like any other variable. For example, in such a language, a function can be passed as an argument to other functions, can be returned by another function and can be assigned as a value to a variable....Assigning a function to a variable js const foo = () => { console.log("foobar");...Passing a function as an argument js function sayHello() { return...

    developer.mozilla.org/en-US/docs/Glossary/First...
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  7. ReportingObserver - Web APIs | MDN

    Learn about the ReportingObserver interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility....deprecated features on our web page: js const options = { types: ["deprecation"]...specified inside the constructor: js observer.observe(); Later on...

    developer.mozilla.org/en-US/docs/Web/API/Report...
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  8. Ember interactivity: Events, classes and state ...

    OK, so that's great progress for now. We can now add todo items to our app, and the state of the data is tracked using our service. Next we'll move on to getting our footer functionality working, including the todo counter, and look at conditional rendering, including correctly styling todos when they've been checked. We'll also wire up our "Clear completed" button....js : js import Component from "@glimmer/component";...the content to the following: js import Component from "@glimmer/component";...

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  9. new.target - JavaScript | MDN

    The new.target meta-property lets you detect whether a function or constructor was called using the new operator. In constructors and functions invoked using the new operator, new.target returns a reference to the constructor or function that new was called upon. In normal function calls, new.target is undefined.... Try it Syntax js new.target Value new.target is...called with new as a constructor. js function Foo() { if (!new.target)...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  10. WebGLProgram - Web APIs | MDN

    Learn about the WebGLProgram interface, including code examples, specifications, and browser compatibility.... js const program = gl.createProgram();...draw something to the screen. js // Use the program gl.useProgram(program);...

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