function diff()

in charts/shared/moment.js [3841:3888]

• 41 lines of code
• 12 McCabe index (conditional complexity)

function diff(input, units, asFloat) {
    var that, zoneDelta, output;

    if (!this.isValid()) {
        return NaN;
    }

    that = cloneWithOffset(input, this);

    if (!that.isValid()) {
        return NaN;
    }

    zoneDelta = (that.utcOffset() - this.utcOffset()) * 6e4;

    units = normalizeUnits(units);

    switch (units) {
        case 'year':
            output = monthDiff(this, that) / 12;
            break;
        case 'month':
            output = monthDiff(this, that);
            break;
        case 'quarter':
            output = monthDiff(this, that) / 3;
            break;
        case 'second':
            output = (this - that) / 1e3;
            break; // 1000
        case 'minute':
            output = (this - that) / 6e4;
            break; // 1000 * 60
        case 'hour':
            output = (this - that) / 36e5;
            break; // 1000 * 60 * 60
        case 'day':
            output = (this - that - zoneDelta) / 864e5;
            break; // 1000 * 60 * 60 * 24, negate dst
        case 'week':
            output = (this - that - zoneDelta) / 6048e5;
            break; // 1000 * 60 * 60 * 24 * 7, negate dst
        default:
            output = this - that;
    }

    return asFloat ? output : absFloor(output);
}