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  1. 'use strict';
  2. var $RangeError = require('es-errors/range');
  3. var $TypeError = require('es-errors/type');
  4. var isInteger = require('math-intrinsics/isInteger');
  5. var isTypedArray = require('is-typed-array');
  6. var whichTypedArray = require('which-typed-array');
  7. var Get = require('./Get');
  8. var IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
  9. var LengthOfArrayLike = require('./LengthOfArrayLike');
  10. var MakeTypedArrayWithBufferWitnessRecord = require('./MakeTypedArrayWithBufferWitnessRecord');
  11. var ToObject = require('./ToObject');
  12. var ToString = require('./ToString');
  13. var TypedArrayLength = require('./TypedArrayLength');
  14. var TypedArraySetElement = require('./TypedArraySetElement');
  15. // https://262.ecma-international.org/15.0/#sec-settypedarrayfromarraylike
  16. module.exports = function SetTypedArrayFromArrayLike(target, targetOffset, source) {
  17. var whichTarget = whichTypedArray(target);
  18. if (!whichTarget) {
  19. throw new $TypeError('Assertion failed: `target` must be a Typed Array');
  20. }
  21. if (targetOffset !== Infinity && (!isInteger(targetOffset) || targetOffset < 0)) {
  22. throw new $TypeError('Assertion failed: `targetOffset` must be a non-negative integer or +Infinity');
  23. }
  24. if (isTypedArray(source)) {
  25. throw new $TypeError('Assertion failed: `source` must not be a Typed Array');
  26. }
  27. var targetRecord = MakeTypedArrayWithBufferWitnessRecord(target, 'SEQ-CST'); // step 1
  28. if (IsTypedArrayOutOfBounds(targetRecord)) {
  29. throw new $TypeError('target is out of bounds'); // step 2
  30. }
  31. var targetLength = TypedArrayLength(targetRecord); // step 3
  32. var src = ToObject(source); // step 4
  33. var srcLength = LengthOfArrayLike(src); // step 5
  34. if (targetOffset === Infinity) {
  35. throw new $RangeError('targetOffset must be a finite integer'); // step 6
  36. }
  37. if (srcLength + targetOffset > targetLength) {
  38. throw new $RangeError('targetOffset + srcLength must be <= target.length'); // step 7
  39. }
  40. var k = 0; // step 8
  41. while (k < srcLength) { // step 9
  42. var Pk = ToString(k); // step 9.a
  43. var value = Get(src, Pk); // step 9.b
  44. var targetIndex = targetOffset + k; // step 9.c
  45. TypedArraySetElement(target, targetIndex, value); // step 9.d
  46. k += 1; // step 9.e
  47. }
  48. };