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use let when creating variables for the first time use const to declare a constant (unlike all caps in ruby) - can't redefine/replace value of constant in JS lowerCamelCase i.e. iPhone increment a value: ``` let x = 5; x++; x is now 6 Methods that accept code: in JavaScript, these are called “anonymous functions” rather than “blocks”. If the method provides values for block variables, in Ruby we name them within optional “pipes” `| |` after the `do`. In JavaScript, we name them within the parentheses `( )` (which are not optional) after `function`. JS comparisons use triple `===`, not double `==`. Beware: There’s also a JS double `==` (non-strict equivalence) operator. In most cases, you should use `===`. `jQuery()` alias `$()` for shorthand In JavaScript, you have to execute the function explicitly by adding the parentheses, even if there are no arguments. ie `chi.text()` not `chi.text` Any CSS property/value pair can be set with the `css()` function. Event handlers with on() ```$("body").on("click", "#bye", function() { $(".west").slideToggle(); });``` This is saying: “Within ``, find elements with an id of `bye`, and when they are clicked run the following callback.” Now, whenever the div is clicked, elements with class `west` will slide up and down.

Apr 17, 2025 - 00:29

use let when creating variables for the first time

use const to declare a constant (unlike all caps in ruby) - can't redefine/replace value of constant in JS

lowerCamelCase i.e. iPhone

increment a value:

``` let x = 5;
x++;

x is now 6



Methods that accept code: in JavaScript, these are called “anonymous functions” rather than “blocks”. 
If the method provides values for block variables, in Ruby we name them within optional “pipes” `| |` after the `do`. In JavaScript, we name them within the parentheses `( )` (which are not optional) after `function`.

JS comparisons use triple `===`, not double `==`.

Beware: There’s also a JS double `==` (non-strict equivalence) operator. In most cases, you should use `===`.


`jQuery()` alias `$()` for shorthand

In JavaScript, you have to execute the function explicitly by adding the parentheses, even if there are no arguments. ie `chi.text()` not `chi.text`

Any CSS property/value pair can be set with the `css()` function.


Event handlers with on()


```$("body").on("click", "#bye", function() {
  $(".west").slideToggle();
});```


This is saying: “Within ``, find elements with an id of `bye`, and when they are clicked run the following callback.” Now, whenever the div is clicked, elements with class `west` will slide up and down.