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SELECT statement with MS ...
Forum: MS Access SQL Tutorials
Last Post: Qomplainerz
07-27-2023, 03:35 PM
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SELECT statement with the...
Forum: MS Access SQL Tutorials
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Forum: HTML5 Tutorials
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Forum: Exercises
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Forum: Exercises
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Last Post: Qomplainerz
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  JavaScript Array findIndex() examples (returns the index)
Posted by: Qomplainerz - 04-04-2023, 08:10 AM - Forum: JavaScript Tutorials - No Replies

The HTML part between the <body></body> tags looks like this:

Code:
<h2>Example 1</h2>
<p id="demo"></p>
<h2>Example 2</h2>
<p>Click "Test" to return the index of the first array element that has a value above this number:</p>
<p><input type="number" id="toCheck" value="18"></p>
<button onclick="myFunction()">Test</button>
<p id="demo2"></p>


The JavaScript part looks like this:

Code:
// Example 1

const ages = [3, 10, 18, 20];

function checkAge(age)
{
  return age > 18;
}

document.getElementById("demo").innerHTML = ages.findIndex(checkAge);

// Example 2

const numbers = [4, 12, 16, 20];

function checkValue(x)
{
  return x > document.getElementById("toCheck").value;
}

function myFunction()
{
  document.getElementById("demo2").innerHTML = numbers.findIndex(checkValue);
}
Print this item

  JavaScript - Additions with values
Posted by: Qomplainerz - 04-04-2023, 08:05 AM - Forum: JavaScript Tutorials - No Replies

Code:
let x = 100 + 50;

document.getElementById("demo").innerHTML = x;
Print this item

  JavaScript - Additions with variables
Posted by: Qomplainerz - 04-04-2023, 08:05 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 100;
let b = 50;
let x = a + b;

document.getElementById("demo").innerHTML = x;
Print this item

  JavaScript - Additions with expressions
Posted by: Qomplainerz - 04-04-2023, 08:04 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 3;
let x = (100 + 50) + a;

document.getElementById("demo").innerHTML = x;
Print this item

  JavaScript - Subtractions with values
Posted by: Qomplainerz - 04-04-2023, 08:04 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 10 - 5;

document.getElementById("demo").innerHTML = a;
Print this item

  JavaScript - Subtractions with variables
Posted by: Qomplainerz - 04-04-2023, 08:03 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 10;
let b = 5;
let c = a - b;

document.getElementById("demo").innerHTML = c;
Print this item

  JavaScript - Subtractions with expressions
Posted by: Qomplainerz - 04-04-2023, 08:02 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 1;
let b = (10 - 1) - a;

document.getElementById("demo").innerHTML = b;
Print this item

  JavaScript - Multiplications with values
Posted by: Qomplainerz - 04-04-2023, 08:02 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 2 * 2;

document.getElementById("demo").innerHTML = a;
Print this item

  JavaScript - Multiplications with variables
Posted by: Qomplainerz - 04-04-2023, 08:01 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 2;
let b = 2;
let c = a * b;

document.getElementById("demo").innerHTML = c;
Print this item

  JavaScript - Multiplications with expressions
Posted by: Qomplainerz - 04-04-2023, 08:01 AM - Forum: JavaScript Tutorials - No Replies

Code:
let a = 2;
let b = (2 * 2) * 2;

document.getElementById("demo").innerHTML = b;
Print this item