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Install it from package npm install double.js or add script on page <script src="http://unpkg.com/double.js"></script>

Initialize is on page with ES5, ES6 or typescript

import Double as D from 'double.js';
var D = require('double.js');

Try to calculate something, here example with R = sqrt(a^2 + b^2)

let R = a.sqr().add(b.sqr()).sqrt();

And example with static method, you need to clone first argument in static method before usage.

let R = D.sqrt(D.add22(D.sqr2(D.clone(a)), D.sqr2(D.clone(b)));

Here full API specification, mutable variable tagged with exclamation mark (!). You can predict theoretical performance time with column Relative time, for example r.pow(3) in 34.5 times slower than r.pow21n(3). Names of instance methods similar to WASM operations.

|--------------------|----------------------------|----------------------------------|-----------------| | Description | Instance method | Static method | Relative time | | Constructors | | new D([a, b]) | | | -//- | | D.clone(X) | | | -//- | | D.fromMul11(a, b) | 17 flop | | -//- | | D.fromSum11(a, b) | 6 flop | | -//- | | D.fromSqr1(a) | 12 flop | | -//- | new D(number) | D.fromNumber(number) | | | -//- | new D('double_number') | D.fromString(string) | | | Converters | X.toNumber() | | | | -//- | X.toExponential(precision) | | | | Addition | X.add(Y) | D.add22(X!, Y) | 22 flop | | -//- | -//- | D.add21(X!, a) | 10 flop | | Subtraction | X.sub(Y) | D.sub22(X!, Y) | 22 flop | | -//- | -//- | D.sub21(X!, a) | 10 flop | | Multiplication | X.mul(Y) | D.mul22(X!, Y) | 24 flop | | -//- | -//- | D.mul21(X!, a) | 23 flop | | Mult. to a=2^n | | D.mul21pow2(X!, a) | 2 flop | | Division | X.div(Y) | D.div22(X!, a) | 27 flop | | -//- | -//- | D.div21(X!, a) | 25 flop | | Power | X.pow(Y) | D.pow22(X!, Y) | ~2588 flop | | Power of integer | | D.pow21n(X!, n) | 24*log2(n) flop | | Absolute value | X.abs() | D.abs2(X!) | | | Negate | X.neg() | D.neg2(X!) | | | Inverse | X.inv() | D.inv2(X!) | 27 flop | | Square | X.sqr() | D.sqr2(X!) | 18 flop | | Square root | X.sqrt() | D.sqrt2(X!) | ~30 flop | | Exponential fn. | X.exp() | D.exp2(X!) | 1264 flop | | Natural logarithm | X.ln() | D.ln2(X!) | ~1264+60 flop | | Hyperbolic sine | X.sinh() | D.sinh2(X!) | 1264+53 flop | | Hyperbolic cosine | X.cosh() | D.cosh2(X!) | 1264+53 flop | | Equals | X.eq(Y) | D.eq22(X, Y) | | | -//- | -//- | D.eq21(X, a) | | | Not equal | X.ne(Y) | D.ne22(X, Y) | | | -//- | -//- | D.ne21(X, a) | | | Greater than | X.gt(Y) | D.gt22(X, Y) | | | -//- | -//- | D.gt21(X, a) | | | Greater or equal | X.ge(Y) | D.ge22(X, Y) | | | -//- | -//- | D.ge21(X, a) | | | Less than | X.lt(Y) | D.lt22(X, Y) | | | -//- | -//- | D.lt21(X, a) | | | Less or equal | X.le(Y) | D.le22(X, Y) | | | -//- | -//- | D.le21(X, a) | |

Also you can find example here or in benchmark.js