javascript array
//create an array like so:
var colors = ["red","blue","green"];
//you can loop through an array like this:
for (var i = 0; i < colors.length; i++) {
console.log(colors[i]);
}javascript array
//create an array like so:
var colors = ["red","blue","green"];
//you can loop through an array like this:
for (var i = 0; i < colors.length; i++) {
console.log(colors[i]);
}js array
var colors = [ "red", "orange", "yellow", "green", "blue" ]; //Array
console.log(colors); //Should give the whole array
console.log(colors[0]); //should say "red"
console.log(colors[1]); //should say "orange"
console.log(colors[4]); //should say "blue"
colors[4] = "dark blue" //changes "blue" value to "dark blue"
console.log(colors[4]); //should say "dark blue"
//I hope this helped :)array javascript
var familly = []; //no familly :(
var familly = new Array() // uncommon
var familly = [Talel, Wafa, Eline, True, 4];
console.log(familly[0]) //Talel
familly[0] + "<3" + familly[1] //Talel <3 Wafa
familly[3] = "Amir"; //New coming member in the familyjavascript atualize array
let yourArray = [1,2,3,4,5];
// if you want to change " 3 " for " 6 " you must count the indexs
// item | 1 2 3 4 5
// index| 0 1 2 3 4
yourArray[2] = 6
// yourArray -> [1,2,6,4,5]array
<!DOCTYPE html>
<html>
<body>
<script>
var str = ["1818-15-3", "1819-16-3"];
var arr = str.split(":");
document.write(arr[1] + ":" + arr[2]);
</script>
</body>
</html>array
## Shallow
Real unit test (isolation, no children render)
### Simple shallow
Calls:
- constructor
- render
### Shallow + setProps
Calls:
- componentWillReceiveProps
- shouldComponentUpdate
- componentWillUpdate
- render
### Shallow + unmount
Calls:
- componentWillUnmount
### Mount
The only way to test componentDidMount and componentDidUpdate.
Full rendering including child components.
Requires a DOM (jsdom, domino).
More constly in execution time.
If react is included before JSDOM, it can require some tricks:
`require('fbjs/lib/ExecutionEnvironment').canUseDOM = true;`
### Simple mount
Calls:
- constructor
- render
- componentDidMount
### Mount + setProps
Calls:
- componentWillReceiveProps
- shouldComponentUpdate
- componentWillUpdate
- render
- componentDidUpdate
### Mount + unmount
Calls:
- componentWillUnmount
### Render
only calls render but renders all children.
So my rule of thumbs is:
- Always begin with shallow
- If componentDidMount or componentDidUpdate should be tested, use mount
- If you want to test component lifecycle and children behavior, use mount
- If you want to test children rendering with less overhead than mount and you are not interested in lifecycle methods, use render
There seems to be a very tiny use case for render. I like it because it seems snappier than requiring jsdom but as @ljharb said, we cannot really test React internals with this.
I wonder if it would be possible to emulate lifecycle methods with the render method just like shallow ?
I would really appreciate if you could give me the use cases you have for render internally or what use cases you have seen in the wild.
I'm also curious to know why shallow does not call componentDidUpdate.
Kudos goes to https://github.com/airbnb/enzyme/issues/465#issuecomment-227697726 this gist is basically a copy of the comment but I wanted to separate it from there as it includes a lot of general Enzyme information which is missing in the docs.Copyright © 2021 Codeinu
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