public trim()

in packages/utilities/fast-colors/src/color-scale.ts [86:141]
50 lines of code
11 McCabe index (conditional complexity)

    public trim(
        lowerBound: number,
        upperBound: number,
        interpolationMode: ColorInterpolationSpace = ColorInterpolationSpace.RGB
    ): ColorScale {
        if (lowerBound < 0 || upperBound > 1 || upperBound < lowerBound) {
            throw new Error("Invalid bounds");
        }
        if (lowerBound === upperBound) {
            return new ColorScale([
                { color: this.getColor(lowerBound, interpolationMode), position: 0 },
            ]);
        }

        const containedStops: ColorScaleStop[] = [];

        for (let i: number = 0; i < this.stops.length; i++) {
            if (
                this.stops[i].position >= lowerBound &&
                this.stops[i].position <= upperBound
            ) {
                containedStops.push(this.stops[i]);
            }
        }

        if (containedStops.length === 0) {
            return new ColorScale([
                { color: this.getColor(lowerBound), position: lowerBound },
                { color: this.getColor(upperBound), position: upperBound },
            ]);
        }

        if (containedStops[0].position !== lowerBound) {
            containedStops.unshift({
                color: this.getColor(lowerBound),
                position: lowerBound,
            });
        }
        if (containedStops[containedStops.length - 1].position !== upperBound) {
            containedStops.push({
                color: this.getColor(upperBound),
                position: upperBound,
            });
        }

        const range: number = upperBound - lowerBound;
        const finalStops: ColorScaleStop[] = new Array(containedStops.length);
        for (let i: number = 0; i < containedStops.length; i++) {
            finalStops[i] = {
                color: containedStops[i].color,
                position: (containedStops[i].position - lowerBound) / range,
            };
        }

        return new ColorScale(finalStops);
    }