adaptive-expressions
Version:
Common Expression Language
43 lines • 1.5 kB
JavaScript
;
/**
* @module adaptive-expressions
*/
/**
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.Last = void 0;
const expressionEvaluator_1 = require("../expressionEvaluator");
const expressionType_1 = require("../expressionType");
const functionUtils_1 = require("../functionUtils");
const functionUtils_internal_1 = require("../functionUtils.internal");
const returnType_1 = require("../returnType");
/**
* Return the last item from a collection.
*/
class Last extends expressionEvaluator_1.ExpressionEvaluator {
/**
* Initializes a new instance of the [Last](xref:adaptive-expressions.Last) class.
*/
constructor() {
super(expressionType_1.ExpressionType.Last, Last.evaluator(), returnType_1.ReturnType.Object, functionUtils_1.FunctionUtils.validateUnary);
}
/**
* @private
*/
static evaluator() {
return functionUtils_1.FunctionUtils.apply((args) => {
let last;
if (typeof args[0] === 'string' && args[0].length > 0) {
last = args[0][args[0].length - 1];
}
if (Array.isArray(args[0]) && args[0].length > 0) {
last = functionUtils_internal_1.InternalFunctionUtils.accessIndex(args[0], args[0].length - 1).value;
}
return last;
});
}
}
exports.Last = Last;
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