| // Copyright (C) 2016 The V8 Project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-number.prototype.toprecision |
| description: > |
| Throws a TypeError if this value is not a number object or value |
| info: | |
| 20.1.3 Properties of the Number Prototype Object |
| |
| The Number prototype object is the intrinsic object %NumberPrototype%. The |
| Number prototype object is an ordinary object. The Number prototype is itself |
| a Number object; it has a [[NumberData]] internal slot with the value +0. |
| |
| [...] |
| The abstract operation thisNumberValue(value) performs the following steps: |
| |
| 1. If Type(value) is Number, return value. |
| 2. If Type(value) is Object and value has a [[NumberData]] internal slot, then |
| a. Assert: value's [[NumberData]] internal slot is a Number value. |
| b. Return the value of value's [[NumberData]] internal slot. |
| 3. Throw a TypeError exception. |
| |
| Number.prototype.toPrecision ( precision ) |
| |
| 1. Let x be ? thisNumberValue(this value). |
| [...] |
| features: [Symbol] |
| ---*/ |
| |
| var toPrecision = Number.prototype.toPrecision; |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call({}, 1); |
| }, "{}"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call("1", 1); |
| }, "string"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call(Number, 1); |
| }, "Number"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call(true, 1); |
| }, "true"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call(false, 1); |
| }, "false"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call(null, 1); |
| }, "null"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call(undefined, 1); |
| }, "undefined"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call(Symbol("1"), 1); |
| }, "symbol"); |
| |
| assert.throws(TypeError, function() { |
| toPrecision.call([], 1); |
| }, "[]"); |