mathjs/examples/chaining.js at develop · sonphnt/mathjs · GitHub

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// chaining

// load math.js (using node.js)

const math = require('../index')

// create a chained operation using the function `chain(value)`

// end a chain using done(). Let's calculate (3 + 4) * 2

const a = math.chain(3)

.add(4)

.multiply(2)

.done()

print(a) // 14

// Another example, calculate square(sin(pi / 4))

const b = math.chain(math.pi)

.divide(4)

.sin()

.square()

.done()

print(b) // 0.5

// A chain has a few special methods: done, toString, valueOf, get, and set.

// these are demonstrated in the following examples

// toString will return a string representation of the chain's value

const chain = math.chain(2).divide(3)

const str = chain.toString()

print(str) // "0.6666666666666666"

// a chain has a function .valueOf(), which returns the value hold by the chain.

// This allows using it in regular operations. The function valueOf() acts the

// same as function done().

print(chain.valueOf()) // 0.66666666666667

print(chain + 2) // 2.6666666666667

// the function subset can be used to get or replace sub matrices

const array = [[1, 2], [3, 4]]

const v = math.chain(array)

.subset(math.index(1, 0))

.done()

print(v) // 3

const m = math.chain(array)

.subset(math.index(0, 0), 8)

.multiply(3)

.done()

print(m) // [[24, 6], [9, 12]]

/**

* Helper function to output a value in the console. Value will be formatted.

* @param {*} value

function print (value) {

const precision = 14

console.log(math.format(value, precision))

}

mathjs/examples/chaining.js at develop · sonphnt/mathjs · GitHub

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