// Using parseInt() to convert to an integer (rounding down)

var floatNumber = 3.14;

var intNumber = parseInt(floatNumber);

console.log(intNumber); // Output: 3

​

// Using Math.floor() to convert to an integer (truncating)

floatNumber = 3.99;

intNumber = Math.floor(floatNumber);

console.log(intNumber); // Output: 3

function float2int (value) {

    return value | 0;

}

​

float2int(3.75); //3 - always just truncates decimals

​

//other options

Math.floor( 3.75 );//3 - goes to floor , note (-3.75 = -4)

Math.ceil( 3.75 ); //4 - goes to ceiling, note (-3.75 = -3)

Math.round( 3.75 );//4 

// x = Number.MAX_SAFE_INTEGER/10 * -1 // -900719925474099.1

​

// value = x      // x=-900719925474099   x=-900719925474099.5 x=-900719925474099.6

​

Math.floor(value) // -900719925474099     -900719925474100     -900719925474100

Math.ceil(value)  // -900719925474099     -900719925474099     -900719925474099

Math.round(value) // -900719925474099     -900719925474099     -900719925474100

Math.trunc(value) // -900719925474099     -900719925474099     -900719925474099

parseInt(value)   // -900719925474099     -900719925474099     -900719925474099

value | 0         // -858993459           -858993459           -858993459

~~value           // -858993459           -858993459           -858993459

value >> 0        // -858993459           -858993459           -858993459

value >>> 0       //  3435973837           3435973837           3435973837

value - value % 1 // -900719925474099     -900719925474099     -900719925474099

​

var floatNumber = 3.14;

var integerNumber = Math.floor(floatNumber); // "Math.floor" rounds down the number

​

console.log(integerNumber); // Output: 3

// Declare a float variable

var myFloat = 3.14;

​

// Perform some operations with float

var result = myFloat * 2;

result += 1.5;

​

// Print the result

console.log(result);