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5.2 KiB
1 lines
5.2 KiB
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Let C be the this value.\n\t// edit(@eps1lon): we're not calling it as Array.from\n\tconst C = Array;\n\n\t// 2. Let items be ToObject(arrayLike).\n\tconst items = Object(arrayLike);\n\n\t// 3. ReturnIfAbrupt(items).\n\tif (arrayLike == null) {\n\t\tthrow new TypeError(\n\t\t\t\"Array.from requires an array-like object - not null or undefined\"\n\t\t);\n\t}\n\n\t// 4. If mapfn is undefined, then let mapping be false.\n\t// const mapFn = arguments.length > 1 ? arguments[1] : void undefined;\n\n\tif (typeof mapFn !== \"undefined\") {\n\t\t// 5. else\n\t\t// 5. a If IsCallable(mapfn) is false, throw a TypeError exception.\n\t\tif (!isCallable(mapFn)) {\n\t\t\tthrow new TypeError(\n\t\t\t\t\"Array.from: when provided, the second argument must be a function\"\n\t\t\t);\n\t\t}\n\t}\n\n\t// 10. Let lenValue be Get(items, \"length\").\n\t// 11. Let len be ToLength(lenValue).\n\tconst len = toLength(items.length);\n\n\t// 13. If IsConstructor(C) is true, then\n\t// 13. a. Let A be the result of calling the [[Construct]] internal method\n\t// of C with an argument list containing the single item len.\n\t// 14. a. Else, Let A be ArrayCreate(len).\n\tconst A = isCallable(C) ? Object(new C(len)) : new Array(len);\n\n\t// 16. Let k be 0.\n\tlet k = 0;\n\t// 17. Repeat, while k < len… (also steps a - h)\n\tlet kValue;\n\twhile (k < len) {\n\t\tkValue = items[k];\n\t\tif (mapFn) {\n\t\t\tA[k] = mapFn(kValue, k);\n\t\t} else {\n\t\t\tA[k] = kValue;\n\t\t}\n\t\tk += 1;\n\t}\n\t// 18. Let putStatus be Put(A, \"length\", len, true).\n\tA.length = len;\n\t// 20. Return A.\n\treturn A;\n}\n"],"file":"array.from.js"} |