get array of color between two colors

generateGradient.js

function hexToRgb(hex){
	var r, g, b, parts;
    	hex = hex.replace('#', '');
    	if(hex.length !== 3 && hex.length !== 6){
        	return [255,255,255];
    	}
    	if(hex.length == 3){
        	hex = hex[0]+hex[0]+hex[1]+hex[1]+hex[2]+hex[2];
    	}
    	r = parseInt(hex.substr(0, 2), 16);
    	g = parseInt(hex.substr(2, 2), 16);
    	b = parseInt(hex.substr(4, 2), 16);

    	return [r,g,b];
}

function rgbToHex(color){
	color[0] = (color[0] > 255) ? 255 : (color[0] < 0) ? 0 : color[0];
	color[1] = (color[1] > 255) ? 255 : (color[1] < 0) ? 0 : color[1];
	color[2] = (color[2] > 255) ? 255 : (color[2] < 0) ? 0 : color[2];

	return this.zeroFill(color[0].toString(16), 2) + this.zeroFill(color[1].toString(16), 2) + this.zeroFill(color[2].toString(16), 2);
}

function zeroFill( number, width ){
	width -= number.toString().length;
	if ( width > 0 ){
  		return new Array( width + (/\./.test( number ) ? 2 : 1) ).join( '0' ) + number;
	}
	return number;
}

function generateGradient(colorA, colorB, steps){
	var result = [], rInterval, gInterval, bInterval;

	colorA = this.hexToRgb(colorA);
	colorB = this.hexToRgb(colorB);
	steps -= 1;

	rStep = ( Math.max(colorA[0], colorB[0]) - Math.min(colorA[0], colorB[0]) ) / steps;
	gStep = ( Math.max(colorA[1], colorB[1]) - Math.min(colorA[1], colorB[1]) ) / steps;
	bStep = ( Math.max(colorA[2], colorB[2]) - Math.min(colorA[2], colorB[2]) ) / steps;

	result.push( '#'+this.rgbToHex(colorA) );

	var rVal = colorA[0],
		gVal = colorA[1],
		bVal = colorA[2];

	for (var i = 0; i < (steps-1); i++) {
		rVal = (colorA[0] < colorB[0]) ? rVal + Math.round(rStep) : rVal - Math.round(rStep);
		gVal = (colorA[1] < colorB[1]) ? gVal + Math.round(gStep) : gVal - Math.round(gStep);
		bVal = (colorA[2] < colorB[2]) ? bVal + Math.round(bStep) : bVal - Math.round(bStep);
		result.push( '#'+this.rgbToHex([rVal, gVal, bVal]) );
	};

	result.push( '#'+this.rgbToHex(colorB) );

	return result;
}

console.log(generateGradient('#143945', '#D5B745', 11));