mathjs/src/function/arithmetic/ceil.js

/**
 * Round a value towards plus infinity
 *
 *     ceil(x)
 *
 * For matrices, the function is evaluated element wise.
 *
 * @param {Number | Complex | Array | Matrix} x
 * @return {Number | Complex | Array | Matrix} res
 */
math.ceil = function ceil(x) {
  if (arguments.length != 1) {
    throw newArgumentsError('ceil', arguments.length, 1);
  }

  if (isNumber(x)) {
    return Math.ceil(x);
  }

  if (x instanceof Complex) {
    return Complex.create (
        Math.ceil(x.re),
        Math.ceil(x.im)
    );
  }

  if (Array.isArray(x) || x instanceof Matrix) {
    return util.map(x, math.ceil);
  }

  if (x.valueOf() !== x) {
    // fallback on the objects primitive value
    return math.ceil(x.valueOf());
  }

  throw newUnsupportedTypeError('ceil', x);
};