(Adds comments from U.S. CEO, e-commerce chief and background, updates shares)
WASHINGTON, Nov 14 (Reuters) - Walmart Inc reported better-than-expected third quarter U.S. comparable sales on Thursday and raised its full-year outlook as a strong economy boosted purchases at its stores and website and the retailer picked up market share in food and other groceries.
The world's largest retailer has now posted a 21-quarter, or more than five-year, streak of U.S. growth, unmatched by any other retail chain. Its shares rose 2.5 percent in early trade.
Consumer spending going in to the crucial holiday season remains healthy, Chief Financial Officer Brett Biggs told Reuters in an interview on Thursday. Retailers earn a sizeable chunk of their annual revenue during November and December.
"The consumer remains in pretty good shape, employment situation is good, fuel prices are low wage growth is pretty good," he said.
Walmart has also managed to minimize the impact from tariffs on imports from China, imposed by President Donald Trump, Biggs said. "I think we've muted the impact (of tariffs) pretty well up to this point."
The retailer gets 56% of its revenue from food and grocery sales, which allows it to manage the pressure from tariffs better than many rivals, analysts said.
Earlier this week, Trump dangled the prospect of completing an initial trade deal with China "soon," but offered no new details on negotiations.
In October, Walmart said its chief executive for U.S. operations, Greg Foran, will leave the company and be replaced by the head of its Sam's Club warehouse chain unit, John Furner.
The U.S. business has "a lot of momentum", Furner told reporters on Thursday. His priority is to maintain that pace until the end of the holiday season, he added.
The company is focused on spreading out sales during this year's compressed holiday season, instead of focusing on a few big days, executives said. Online sales rose 41%, higher than the previous quarter's increase of 37 pct and greater than the company's expectation of 35%.
Operating income continued to remain under pressure and fell 5.4 percent to $4.7 billion as a result of ongoing investments in its e-commerce business including faster delivery.
Walmarts online expansion has come at a cost to profitability, and losses at the U.S. e-commerce business could rise to about $1.7 billion this year from $1.4 billion in 2018, according to estimates from Morgan Stanley.
U.S. e-commerce chief Marc Lore said improving operating profitability is a key area of focus for the company.
Sales at U.S. stores open at least a year rose 3.2%, excluding fuel, in the quarter ended Oct.31. Analysts estimated growth of 2.9%, according to IBES data from Refinitiv.
Adjusted earnings per share increased to $1.16 per share, beating expectations of $1.09 per share.
Walmart forecast earnings per share, including the impact from its acquisition of Indian e-commerce retailer Flipkart, to increase "slightly" from a year ago.
Total revenue rose 2.5 percent to $128 billion.
(Reporting by Nandita Bose in Washington; Editing by Steve Orlofsky and Nick Zieminski)