@env0/dynamo-easy/dist/_esm2015/dynamo/expression/functions/operator-parameter-arity.function.js

DynamoDB client for NodeJS and browser with a fluent api to build requests. We take care of the type mapping between JS and DynamoDB, customizable trough typescript decorators.

import { isFunctionOperator } from './is-function-operator.function';
import { isNoParamFunctionOperator } from './is-no-param-function-operator.function';
/**
 * Every expression condition operator has a predefined arity (amount) of function parameters, this method
 * returns this value
 *
 * @returns {number} The amount of required method parameters when calling an operator function
 * @hidden
 */
export function operatorParameterArity(operator) {
    if (isFunctionOperator(operator) && isNoParamFunctionOperator(operator)) {
        return 0;
    }
    else {
        switch (operator) {
            case '=':
            case '>':
            case '>=':
            case '<':
            case '<=':
            case '<>':
            case 'begins_with':
            case 'attribute_type':
            case 'contains':
            case 'not_contains':
            case 'IN':
                return 1;
            case 'BETWEEN':
                return 2;
            default:
                throw new Error(`no parameter arity defined for operator ${operator}`);
        }
    }
}
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