Category: an

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 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 set an attribute to ignore null value json c#


[JsonProperty(NullValueHandling=NullValueHandling.Ignore)]
// or
[JsonProperty("property_name", NullValueHandling=NullValueHandling.Ignore)]
​
// or for all properties in a class
[JsonObject(ItemNullValueHandling = NullValueHandling.Ignore)]

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how to send an alert in javascript


//you can either do this:
​
function mousePressed() {
    //you can have any message
  alert("I'm the best");
}
​
//or you can do this:
​
function keyPressed() {
    //you can do any key
  if (keyCode === UP_ARROW) {
    //and any message
    alert(number = random(0, 500));
  }
}
​
//or you can do an (if) statement
​
if(x > width) {
    alert("yay you did it");
}

Alert in JS doesn't return anything -- it just Displays Message

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how to scroll to an element javascript react


class ReadyToScroll extends Component {
​
    constructor(props) {
        super(props)
        this.myRef = React.createRef()  
    }
​
    render() {
        return <div ref={this.myRef}></div> 
    }  
​
    scrollToMyRef = () => window.scrollTo(0, this.myRef.current.offsetTop)   
    // run this method to execute scrolling. 
​
}

import React, { useRef } from 'react'
​
const scrollToRef = (ref) => window.scrollTo(0, ref.current.offsetTop)   
// General scroll to element function
​
const ScrollDemo = () => {
​
   const myRef = useRef(null)
   const executeScroll = () => scrollToRef(myRef)
​
   return (
      <> 
         <div ref={myRef}>I wanna be seen</div> 
         <button onClick={executeScroll}> Click to scroll </button> 
      </>
   )
}
​

import { scroller } from "react-scroll";
​
// excluded React component syntax...
​
  scrollToSection = () => {
    scroller.scrollTo("your_css_class_here", {
      duration: 800,
      delay: 0,
      smooth: "easeInOutQuart",
    });
  };
​

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