JavaScript/Array9.html at main · sudeepnagar/JavaScript · GitHub

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<h3> demo on array methods</h3>
  <script>

	 const a=[21,22,30,55,60,70,30,90];
	 let str="notepad plus plus";

	 document.write( `Eles ${a}<br>`);
	 document.write( `Str ${str}<br>`);

	 //includes()->searching in arr and str(return true or false)
	 document.write( `10 found ? ${a.includes(10)}<br>`);
	 document.write( `55 found ? ${a.includes(55)}<br>`);
	 document.write( `plus found ? ${str.includes('plus')}<br>`);
	document.write( `t found ? ${str.includes('t')}<br>`);

	//indexOf() ->return position(index no)of element, if multiple occrence then return 1st occrence and if not found then return -1
	document.write( `plus index : ${str.indexOf('plus')}<br>`);
	document.write( `p index : ${str.indexOf('p')}<br>`);
	document.write( `j index : ${str.indexOf('j')}<br>`);
	document.write( `80 index : ${a.indexOf(80)}<br>`);
	document.write( `30 index : ${a.indexOf(30,5)}<br>`);
	document.write( `p index : ${str.indexOf('p',5)}<br>`);
	document.write( `p index : ${str.indexOf('p',str.indexOf('p')+1)}<br>`);

	//lastIndexOf()->
    //reverse()->reverse array , String not supported
	a.reverse();
	document.write(`reverse eles ${a}<br>`);

	//toString()-> convert array into string
	document.write(`${a.toString()}<br>`);
	document.write(`${str.toString()}<br>`);

	//sort()
	a.sort();
	document.write(`sort eles: ${a}<br>`);

	let names=['sudeep','sourabh','vivek','ankit','soumy'];
	names.sort();
	document.write(`sorted names: ${names}<br>`);

	//join()=> joining elements with specified symbol
	document.write(`${a.join("@")}<br>`);

	//use and throw concept
	document.write(`${[10,20,30].includes(20)}<br>`); //anonymous array
	document.write(`${"welcome".indexOf("come")}`);//anonymous string


  </script>