adaptive-expressions
Version:
Common Expression Language
51 lines • 1.68 kB
JavaScript
/**
* @module adaptive-expressions
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.Count = void 0;
const expressionEvaluator_1 = require("../expressionEvaluator");
const expressionType_1 = require("../expressionType");
const functionUtils_1 = require("../functionUtils");
const returnType_1 = require("../returnType");
/**
* Return the number of items in a collection.
*/
class Count extends expressionEvaluator_1.ExpressionEvaluator {
/**
* Initializes a new instance of the [Count](xref:adaptive-expressions.Count) class.
*/
constructor() {
super(expressionType_1.ExpressionType.Count, Count.evaluator(), returnType_1.ReturnType.Number, Count.validator);
}
/**
* @private
*/
static evaluator() {
return functionUtils_1.FunctionUtils.apply((args) => {
let count;
if (typeof args[0] === 'string' || Array.isArray(args[0])) {
count = args[0].length;
}
else if (args[0] instanceof Map) {
count = args[0].size;
}
else if (typeof args[0] === 'object') {
count = Object.keys(args[0]).length;
}
return count;
}, functionUtils_1.FunctionUtils.verifyContainer);
}
/**
* @private
*/
static validator(expression) {
functionUtils_1.FunctionUtils.validateOrder(expression, [], returnType_1.ReturnType.String | returnType_1.ReturnType.Array);
}
}
exports.Count = Count;
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;