What does 1 mean in JS?

What does 1 mean in JS?

-1 means the first goes before the second, 1 means it goes after, and 0 means they’re equivalent. The sort function uses the comparisons in the function you pass it to sort the function.

What does 0 mean js?

In JavaScript “0” is equal to false because “0” is of type string but when it tested for equality the automatic type conversion of JavaScript comes into effect and converts the “0” to its numeric value which is 0 and as we know 0 represents false value. So, “0” equals to false.

What does First () do in JavaScript?

The first() function gives the first value of the collection. Simply means it returns the first value or the first method returns the first element in the collection that passes a given condition. In JavaScript, the array is first converted to a collection and then the function is applied to the collection.

What does += mean in JavaScript?

The addition assignment operator ( += ) adds the value of the right operand to a variable and assigns the result to the variable. Addition or concatenation is possible.

What is $0 HTML?

$0 returns the most recently selected element or JavaScript object, $1 returns the second most recently selected one, and so on.

What does == $0 mean?

It’s the last selected DOM node index. Chrome assigns an index to each DOM node you select. So $0 will always point to the last node you selected, while $1 will point to the node you selected before that. Think of it like a stack of most recently selected nodes.

How do I run JavaScript programs?

The simplest way to run a piece of JavaScript code is built-in the software which you use everyday, and maybe are using it right now to read this answer: browser. So press Ctrl + Shift + I or F12 once you open your browser.

What is operator in JavaScript?

Example. The assignment operator ( =) assigns a value to a variable.

  • Assignment
  • ) multiplies numbers.
  • Multiplying. Arithmetic operators are fully described in the JS Arithmetic chapter. Assignment operators assign values to JavaScript variables.
  • What are the types of JavaScript?

    JavaScript has one complex data type, the Object data type, and it has five simple data types: Number, String, Boolean, Undefined, and Null. Note that these simple (primitive) data types are immutable (cannot be changed), while objects are mutable (can be changed).

    What is modulus in JavaScript?

    Modulo is an Arithmetic Operator in core javaScript that helps to find out the remainder of a division between two numbers. Most of the time the javaScript modulo operator does work as expected, however it follow a certain convention, and sometimes it can cause problems when dealing with negative numbers.