mathjs/docs/reference/functions/select.md

Function select

Wrap any value in a Selector, allowing to perform chained operations on the value.

All methods available in the math.js library can be called upon the selector, and then will be evaluated with the value itself as first argument. The selector can be closed by executing selector.done(), which will return the final value.

Example usage: math.select(3) .add(4) .subtract(2) .done(); // 5 math.select( 1, 2], [3, 4 ) .set([1, 1], 8) .multiply(3) .done(); // 24, 6], [9, 12

The Selector has a number of special functions:

• done() Finalize the chained operation and return the selectors value.
• valueOf() The same as done()
• toString() Executes math.format() onto the selectors value, returning a string representation of the value.
• get(...) Get a subselection of the selectors value. Only applicable when the value has a method get, for example when value is a Matrix or Array.
• set(...) Replace a subselection of the selectors value. Only applicable when the value has a method get, for example when value is a Matrix or Array.

Parameters

Parameter	Type	Description
value	*

Returns

Type	Description
math.chaining.Selector	selector