how to sort array least to greatest javascript stACK


function sortArray(array) {
var temp = 0;
for (var i = 0; i < array.length; i++) {
for (var j = i; j < array.length; j++) {
if (array[j] < array[i]) {
temp = array[j];
array[j] = array[i];
array[i] = temp;
}
}
}
return array;
}

console.log(sortArray([3,1,2]));

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how to sort array without using sort method in javascript


function bubbleSort(array) {
var done = false;
while (!done) {
done = true;
for (var i = 1; i < array.length; i += 1) {
if (array[i - 1] > array[i]) {
done = false;
var tmp = array[i - 1];
array[i - 1] = array[i];
array[i] = tmp;
}
}
}

return array;
}

var numbers = [12, 10, 15, 11, 14, 13, 16];
bubbleSort(numbers);
console.log(numbers);

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how to split an array in javascript


var str = "How are you doing today?";

var res = str.split(" ");

// Returns new array from exising one
arr.slice(start, end);

// Example array.
let randomArray = [3, 5, 1, 5, 7,];
// Create an empty array.
let arrayOfArrays = [];

function splitArray( array ) {
while (array.length > 0) {
let arrayElement = array.splice(0,1);
arrayOfArrays.push(arrayElement);
}
return arrayOfArrays;
}

// Call the function while passing in an array of your choice.
splitArray(randomArray)
// => [ [ 3 ], [ 5 ], [ 1 ], [ 5 ], [ 7 ] ]

var myString = 'no,u';
var MyArray = myString.split(',');//splits the text up in chunks

let data = 'Child 1 First Name: AlinChild 1 Gender: FemalenChild 1 Hair Color: BlondenChild 1 Hair Style: WavynChild 1 Skin Tone: TannChild 2 First Name: Morgan nChild 2 Gender: FemalenChild 2 Hair Color: BrownnChild 2 Hair Style: PonytailnChild 2 Skin Tone: LightnRelationship 1 to 2: BrothernRelationship 2 to 1: Brothern';
let target = {};

data.split('n').forEach((pair) => {
if(pair !== '') {
let splitpair = pair.split(': ');
let key = splitpair[0].charAt(0).toLowerCase() + splitpair[0].slice(1).split(' ').join('');
target[key] = splitpair[1];
}
});

console.dir(target);

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HOW TO SPLIT AN ARRAY JAVASCRIPT


array.splice(index, number, item1, ....., itemN)

var str = "How are you doing today?";

var res = str.split(" ");

// Example array.
let randomArray = [3, 5, 1, 5, 7,];
// Create an empty array.
let arrayOfArrays = [];

function splitArray( array ) {
while (array.length > 0) {
let arrayElement = array.splice(0,1);
arrayOfArrays.push(arrayElement);
}
return arrayOfArrays;
}

// Call the function while passing in an array of your choice.
splitArray(randomArray)
// => [ [ 3 ], [ 5 ], [ 1 ], [ 5 ], [ 7 ] ]

//split into array of strings.
var str = "Well, how, are , we , doing, today";
var res = str.split(",");

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how to shuffle an array javascript


/**
* Shuffles array in place.
* @param {Array} a items An array containing the items.
*/
function shuffle(a) {
var j, x, i;
for (i = a.length - 1; i > 0; i--) {
j = round(random() * (i + 1));
x = a[i];
a[i] = a[j];
a[j] = x;
}
return a;
}

shuffle(array);

function randomArrayShuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex;
while (0 !== currentIndex) {
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}
var alphabet=["a","b","c","d","e"];
randomArrayShuffle(alphabet);
//alphabet is now shuffled randomly = ["d", "c", "b", "e", "a"]



function shuffleArray(array) {
for (let i = array.length - 1; i > 0; i--) {
const j = Math.floor(Math.random() * (i + 1));
[array[i], array[j]] = [array[j], array[i]];
}
}

yourArray.sort(function() { return 0.5 - Math.random() });

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how to set value in array react hook usestate


const[array,setArray]= useState([
{id: 1, value: "a string", othervalue: ""},
{id: 2, value: "another string", othervalue: ""},
{id: 3, value: "a string", othervalue: ""},
])

const updateItem =(id, whichvalue, newvalue)=> {
var index = array.findIndex(x=> x.id === id);

let g = array[index]
g[whichvalue] = newvalue
if (index === -1){
// handle error
console.log('no match')
}
else
setArray([
...array.slice(0,index),
g,
...array.slice(index+1)
]
);
}
//how to use the function
onPress={()=>updateItem(2,'value','ewfwf')}
onPress={()=>updateItem(1,'othervalue','ewfwf')}
/*
the first input of the function is the id of the item
the second input of the function is the atrribute that you wish to change
the third input of the function is the new value for that attribute
It's a pleasure :0
~atlas
*/

setTheArray([...theArray, newElement]);

const {useState, useCallback} = React;
function Example() {
const [theArray, setTheArray] = useState([]);
const addEntryClick = () => {
setTheArray([...theArray, `Entry ${theArray.length}`]);
};
return [
<input type="button" onClick={addEntryClick} value="Add" />,
<div>{theArray.map(entry =>
<div>{entry}</div>
)}
</div>
];
}

ReactDOM.render(
<Example />,
document.getElementById("root")
);

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