Number Methods tutorial in JavaScript
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<title>Number Methods JavaScript</title>
<script>
var a = "99";
var num = Number(a);
document.write(num + 10 + "<br>");
var a2 = true;
var a3 = false;
var a4 = "99 43";
var numTwo = Number(a2);
var numThree = Number(a3);
var numFour = Number(a4);
document.write(numTwo + "<br>");
document.write(numThree + "<br>");
document.write(numFour + "<br><br>");
var a5 = "45 88 21";
var numFive = parseInt(a5);
document.write(numFive + "<br>");
var a6 = "65.98";
var numSix = parseInt(a6);
document.write(numSix + "<br>");
var a7 = "050 years";
var numSeven = parseInt(a7);
document.write(numSeven + "<br>");
var a8 = "he is 70 years old";
var numEight = parseInt(a8);
document.write(numEight + "<br><br>");
var a9 = "he is 40 years old";
var numNine = parseFloat(a9);
document.write(numNine + "<br>");
var a10 = "10.33";
var numTen = parseFloat(a10);
document.write(numTen + "<br>");
var a11 = "10 30";
var numEleven = parseFloat(a11);
document.write(numEleven + "<br>");
var a12 = "10.30 years";
var numTwelve = parseFloat(a12);
document.write(numTwelve + "<br><br>");
var a13 = 100;
var numThirteen = Number.isFinite(a13);
document.write(numThirteen + "<br>");
var a14 = -100;
var numFourteen = Number.isFinite(a14);
document.write(numFourteen + "<br>");
var a15 = "100";
var numFifteen = Number.isFinite(a15);
document.write(numFifteen + "<br>");
var a16 = -100.53;
var numSixteen = Number.isFinite(a16);
document.write(numSixteen + "<br>");
var a17 = "Hello";
var numSeventeen = Number.isFinite(a17);
document.write(numSeventeen + "<br>");
var a18 = Infinity;
var numEighteen = Number.isFinite(a18);
document.write(numEighteen + "<br>");
var a28 = true;
var numTwentyEight = Number.isFinite(a28);
document.write(numTwentyEight + "<br>");
var a29 = false;
var numTwentyNine = Number.isFinite(a29);
document.write(numTwentyNine + "<br><br>");
var a19 = Infinity;
var numNineteen = Number.isInteger(a19);
document.write(numNineteen + "<br>");
var a20 = 100;
var numTwenty = Number.isInteger(a20);
document.write(numTwenty + "<br>");
var a21 = "100";
var numTwentyOne = Number.isInteger(a21);
document.write(numTwentyOne + "<br>");
var a22 = 10.50;
var numTwentyTwo = Number.isInteger(a22);
document.write(numTwentyTwo + "<br>");
var a23 = -50;
var numTwentyThree = Number.isInteger(a23);
document.write(numTwentyThree + "<br>");
var a24 = 10 - 5;
var numTwentyFour = Number.isInteger(a24);
document.write(numTwentyFour + "<br>");
var a25 = 10.50 - 5;
var numTwentyFive = Number.isInteger(a25);
document.write(numTwentyFive + "<br>");
var a26 = true;
var numTwentySix = Number.isInteger(a26);
document.write(numTwentySix + "<br>");
var a27 = false;
var numTwentySeven = Number.isInteger(a27);
document.write(numTwentySeven + "<br><br>");
var a30 = 5.56789;
var numThirty = a30.toFixed(2);
document.write(numThirty + "<br>");
var a31 = 5.56789;
var numThirtyOne = a31.toFixed(3);
document.write(numThirtyOne + "<br><br>");
var a32 = 5.56789;
var numThirtyTwo = a32.toPrecision(2);
document.write(numThirtyTwo + "<br>");
var a33 = 5.56789;
var numThirtyThree = a32.toPrecision(4);
document.write(numThirtyThree + "<br>");
var a34 = 5.56789;
var numThirtyFour = a34.toPrecision(10);
document.write(numThirtyFour + "<br><br>");
</script>
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