Function constrain

Returns a number constrained within a range.

Example

const n1 = Chalkboard.numb.constrain(2); // Returns 1
const n2 = Chalkboard.numb.constrain(1); // Returns 1
const n3 = Chalkboard.numb.constrain(0.5); // Returns 0.5
const n4 = Chalkboard.numb.constrain(0); // Returns 0
const n5 = Chalkboard.numb.constrain(-1); // Returns 0
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