add

Number → Number → Number

Added in v0.1.0

Adds two values.

See also subtract.

R.add(2, 3);       //=>  5
R.add(7)(10);      //=> 17

divide

Number → Number → Number

Parameters

• aThe first value.

• bThe second value.

Returns Number The result of a / b.

Added in v0.1.0

Divides two numbers. Equivalent to a / b.

See also multiply.

R.divide(71, 100); //=> 0.71
const half = R.divide(R.__, 2);
half(42); //=> 21
const reciprocal = R.divide(1);
reciprocal(4);   //=> 0.25

multiply

Number → Number → Number

Parameters

• aThe first value.
• bThe second value.

Returns Number The result of a * b.

Added in v0.1.0

Multiplies two numbers. Equivalent to a * b but curried.

See also divide.

const double = R.multiply(2);
const triple = R.multiply(3);
double(3);       //=>  6
triple(4);       //=> 12
R.multiply(2, 5);  //=> 10

product

[Number] → Number

Parameters

• listAn array of numbers

Returns Number The product of all the numbers in the list.

Added in v0.1.0

Multiplies together all the elements of a list.

See also reduce.

R.product([2,4,6,8,100,1]); //=> 38400

subtract

Number → Number → Number

Parameters

• aThe first value.
• bThe second value.

Returns Number The result of a - b.

Added in v0.1.0

Subtracts its second argument from its first argument.

See also add.

R.subtract(10, 8); //=> 2
const minus5 = R.subtract(R.__, 5);
minus5(17); //=> 12
const complementaryAngle = R.subtract(90);
complementaryAngle(30); //=> 60
complementaryAngle(72); //=> 18

sum

[Number] → Number

Parameters

• listAn array of numbers

Returns Number The sum of all the numbers in the list.

Added in v0.1.0

Adds together all the elements of a list.

See also reduce.

R.sum([2,4,6,8,100,1]); //=> 121

modulo

Number → Number → Number

Parameters

• aThe value to the divide.
• bThe pseudo-modulus

Returns Number The result of b % a.

Added in v0.1.1

Divides the first parameter by the second and returns the remainder. Note that this function preserves the JavaScript-style behavior for modulo. For mathematical modulo see mathMod.

See also mathMod.

R.modulo(17, 3); //=> 2
// JS behavior:
R.modulo(-17, 3); //=> -2
R.modulo(17, -3); //=> 2
const isOdd = R.modulo(R.__, 2);
isOdd(42); //=> 0
isOdd(21); //=> 1